khoahoc.vietjack.com
Kích hoạt VIP
Tạo VIP

Danh sách câu hỏi ( Có 2,404,801 câu hỏi trên 48,097 trang )

Tổng hợp đề ôn thi THPTQG môn Hóa Học cực hay có lời giải (Đề số 13)

Cho hỗn hợp C và S vào dung dịch HNO3 đặc, đun nóng thu được hỗn hợp khí X và dung dịch Y. Thành phần của X là 

Hóa học Tốt nghiệp THPT
Xem chi tiết 520 lượt xem 6 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 16)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35. Do you feel like your teenager is spending most of the day glued to a phone screen? You're not too far off. A new survey from the Pew Research Center reveals the surprising ways that technology intersects with teen friendships — and the results show that 57 percent of teens have made at least one new friend online. Even more surprisingly, only 20 percent of those digital friends ever meet in person. While teens do connect with their friends face-to-face outside of school, they spend 55 percent of their day texting with friends, and only 25 percent of teens are spending actual time with their friends on a daily basis (outside of school hallways). These new forms of communication are key in maintaining friendships day-to-day — 27 percent of teens instant message their friends every day, 23 percent connect through social media every day, and 7 percent even video chat daily. Text messaging remains the main form of communication — almost half of survey respondents say it's their chosen method of communication with their closest friend. While girls are more likely to text with their close friends, boys are meeting new friends (and maintaining friendships) in the gaming world-89 percent play with friends they know, and 54 percent play with online-only friends. Whether they're close with their teammates or not, online garners say that playing makes them feel "more connected" to friends they know, or garners they've never met. When making new friends, social media has also become a major part of the teenage identity-62 percent of teens are quick to share their social media usernames when connecting with a new friend (although 80 percent still consider their phone number the best method of contact). Despite the negative consequences-21 percent of teenage users feel worse about their lives because of posts they see on social media — teens also have found support and connection through various platforms. In fact, 68 percent of teens received support during a challenging time in their lives via social media platforms. Just as technology has become a gateway for new friendships, or a channel to stay connected with current friends, it can also make a friendship breakup more public. The study reveals that girls are more likely to block or unfriend former allies, and 68 percent of all teenage users report experiencing "drama among their friends on social media." Question 34: What is the synonym of the word "breakup" in the last paragraph?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 8.5 K lượt xem 6 năm trước
230 Bài tập thí nghiệm Hóa Học cực hay có đáp án(Đề số 3)

Đun nóng dung dịch E gồm hai chất tan (đá bọt giúp điều hòa quá trình sôi), thu được khí T bằng phương pháp đẩy nước theo hình vẽ bên: Chất nào sau đây phù hợp với T? 

Hóa học Tốt nghiệp THPT
Xem chi tiết 532 lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 51 to 60.   Throughout history, women have had responsibility for healing the sick. However, it is only in comparative recent times that they have been allowed to train as doctors at medical schools in Britain. Yet in that short time, they have (37) _________ an enormous contribution to modem medicine.   The first female doctors were nuns (38) ________                         gave advice about diseases and (39) ________ and prepared medicines. In ancient Rome, women healers were considered skillful and respected. In Britain, for centuries, male doctors were suspicious of women who practised medicine (40) _________ and in 1512 a law was passed making it illegal for them to do so. Women couldn’t study medicine at universities (41) ____________ the 19th century and they only began to gain equality with male doctors in the 20th century. Điền vào số 41

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 705 lượt xem 6 năm trước
229 Bài tập thí nghiệm từ đề thi đại học cực hay có lời giải(P7)

Tiến hành thí nghiệm theo các bước sau: Bước 1: Cho vài giọt dung dịch iot (màu vàng nhạt) vào ống nghiệm đựng sẵn 2 ml dung dịch hồ tinh bột (không màu) và để trong thời gian 2 phút ở nhiệt độ thường. Bước 2: Đun nóng ống nghiệm trên ngọn lửa đèn cồn (không để sôi) khoảng 1-2 phút. Bước 3: Ngâm ống nghiệm trong cốc nước nguội khoảng 5-6 phút. Phát biểu nào sau đây đúng?

Hóa học Tốt nghiệp THPT
Xem chi tiết 539 lượt xem 6 năm trước
Tổng hợp đề ôn thi THPTQG môn Hóa Học cực hay có lời giải (Đề số 13)

Cấu hình electron nguyên tử của silic là

Hóa học Tốt nghiệp THPT
Xem chi tiết 2.7 K lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Sinh học cực hay có lời giải chi tiết (đề số 25)

Cho 1 quần thể giao phối ngẫu nhiên. Ở thế hệ xuất phát P có 0,4AA: 0,6Aa. Biết không xảy ra đột biến mới, tổ hợp gen có sức sống như nhau. Nếu đến F3 có 1000 cá thể được sinh ra. Theo lý thuyết, số cá thể của từng kiểu gen là:

Sinh học Tốt nghiệp THPT
Xem chi tiết 405 lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 51 to 60.   Throughout history, women have had responsibility for healing the sick. However, it is only in comparative recent times that they have been allowed to train as doctors at medical schools in Britain. Yet in that short time, they have (37) _________ an enormous contribution to modem medicine.   The first female doctors were nuns (38) ________                         gave advice about diseases and (39) ________ and prepared medicines. In ancient Rome, women healers were considered skillful and respected. In Britain, for centuries, male doctors were suspicious of women who practised medicine (40) _________ and in 1512 a law was passed making it illegal for them to do so. Women couldn’t study medicine at universities (41) ____________ the 19th century and they only began to gain equality with male doctors in the 20th century. Điền vào số 40

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.5 K lượt xem 6 năm trước
Luyện tập trang 72

Từ điểm M thuộc cạnh AB của tam giác ABC với AM = 1/2 MB, kẻ các tia song song với AC và BC, chúng cắt BC và AC lầ lượt tại L và N. a) Nêu tất cả các cặp tam giác đồng dạng. b) Đối với mỗi cặp tam giác đồng dạng. Hãy viết các cặp góc bằng nhau và tỉ số đồng dạng tương ứng.

Toán Lớp 8
Xem chi tiết 17.7 K lượt xem 1 năm trước
25 Bộ đề Ôn luyện thi THPTQG môn Sinh Học cực hay có lời giải (Đề số 19)

Quá trình nào sau đây liên quan chặt chẽ với hấp thụ nước và các chất khoáng ở thực vật?

Sinh học Tốt nghiệp THPT
Xem chi tiết 5 K lượt xem 6 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 16)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35. Do you feel like your teenager is spending most of the day glued to a phone screen? You're not too far off. A new survey from the Pew Research Center reveals the surprising ways that technology intersects with teen friendships — and the results show that 57 percent of teens have made at least one new friend online. Even more surprisingly, only 20 percent of those digital friends ever meet in person. While teens do connect with their friends face-to-face outside of school, they spend 55 percent of their day texting with friends, and only 25 percent of teens are spending actual time with their friends on a daily basis (outside of school hallways). These new forms of communication are key in maintaining friendships day-to-day — 27 percent of teens instant message their friends every day, 23 percent connect through social media every day, and 7 percent even video chat daily. Text messaging remains the main form of communication — almost half of survey respondents say it's their chosen method of communication with their closest friend. While girls are more likely to text with their close friends, boys are meeting new friends (and maintaining friendships) in the gaming world-89 percent play with friends they know, and 54 percent play with online-only friends. Whether they're close with their teammates or not, online garners say that playing makes them feel "more connected" to friends they know, or garners they've never met. When making new friends, social media has also become a major part of the teenage identity-62 percent of teens are quick to share their social media usernames when connecting with a new friend (although 80 percent still consider their phone number the best method of contact). Despite the negative consequences-21 percent of teenage users feel worse about their lives because of posts they see on social media — teens also have found support and connection through various platforms. In fact, 68 percent of teens received support during a challenging time in their lives via social media platforms. Just as technology has become a gateway for new friendships, or a channel to stay connected with current friends, it can also make a friendship breakup more public. The study reveals that girls are more likely to block or unfriend former allies, and 68 percent of all teenage users report experiencing "drama among their friends on social media." Question 33: What can be inferred from the passage?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 4.7 K lượt xem 6 năm trước
230 Bài tập thí nghiệm Hóa Học cực hay có đáp án(Đề số 3)

Tiến hành các thí nghiệm sau: (a) Hòa tan hỗn hợp chứa a mol Al2O3 và 2a mol Na2O vào H2O (dư). (b) Cho CrO3 tác dụng với H2O (dư). (c) Sục khí CO2 đến dư vào dung dịch chứa NaAlO2 và NaOH. (d) Cho Cu vào dung dịch Fe2(SO4)3 dư. (e) Cho dung dịch chứa a mol KHSO4 vào dung dịch chứa a mol BaCl2. (g) Cho Al dư vào dung dịch HNO3 (phản ứng không thu được chất khí). (h) Cho KHS vào dung dịch NaOH vừa đủ. Sau khi các phản ứng xảy ra hoàn toàn, số thí nghiệm thu được dung dịch chứa hai chất tan là

Hóa học Tốt nghiệp THPT
Xem chi tiết 371 lượt xem 6 năm trước
ĐỀ LUYỆN TỔNG HỢP (P6)

Cho dãy các chất: axit axetic, etyl axetat, anilin, ancol etylic, phenol, ancol benzylic. Số chất trong dãy phản ứng được với dung dịch NaOH là

Hóa học Tốt nghiệp THPT
Xem chi tiết 2.4 K lượt xem 6 năm trước
Luyện tập trang 72

Cho tam giác ABC, vẽ tam giác A'B'C' đồng dạng với tam giác ABC theo tỉ số đồng dạng k = 2/3.

Toán Lớp 8
Xem chi tiết 13.1 K lượt xem 1 năm trước
Bộ đề luyện thi THPTQG Sinh học cực hay có lời giải chi tiết (đề số 25)

Cấu trúc di truyền của một quần thể (P) như sau: 168BB: 72bb. Biết không xảy ra đột biến mới, tổ hợp gen có sức sống như nhau. Cho giao phối ngẫu nhiên sau 10 thế hệ. Cấu trúc di truyền của quần thể đó là:

Sinh học Tốt nghiệp THPT
Xem chi tiết 459 lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 51 to 60.   Throughout history, women have had responsibility for healing the sick. However, it is only in comparative recent times that they have been allowed to train as doctors at medical schools in Britain. Yet in that short time, they have (37) _________ an enormous contribution to modem medicine.   The first female doctors were nuns (38) ________                         gave advice about diseases and (39) ________ and prepared medicines. In ancient Rome, women healers were considered skillful and respected. In Britain, for centuries, male doctors were suspicious of women who practised medicine (40) _________ and in 1512 a law was passed making it illegal for them to do so. Women couldn’t study medicine at universities (41) ____________ the 19th century and they only began to gain equality with male doctors in the 20th century. Điền vào số 39

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 17.8 K lượt xem 6 năm trước
230 Bài tập thí nghiệm Hóa Học cực hay có đáp án(Đề số 3)

Tiến hành các thí nghiệm sau đây: (a) Ngâm một lá kẽm vào dung dịch CuSO4. (b) Ngâm một lá đồng vào dung dịch FeCl3. (c) Cho thép cacbon tiếp xúc với nước mưa. (d) Cho thép vào dung dịch axit clohiđric. (e) Để sắt tây tiếp xúc với nước tự nhiên. Trong các thí nghiệm trên có bao nhiêu trường hợp xảy ra ăn mòn điện hóa?

Hóa học Tốt nghiệp THPT
Xem chi tiết 676 lượt xem 6 năm trước
25 Bộ đề Ôn luyện thi THPTQG môn Sinh Học cực hay có lời giải (Đề số 19)

Nước từ tế bào lông hút vào mạch gỗ của rễ theo con đường nào?

Sinh học Tốt nghiệp THPT
Xem chi tiết 519 lượt xem 6 năm trước
229 Bài tập thí nghiệm từ đề thi đại học cực hay có lời giải(P7)

Kết quả thí nghiệm của các dung dịch X, Y, Z, T với thuốc thử được ghi ở bảng sau: Các dung dịch X, Y, Z, T lần lượt là  

Hóa học Tốt nghiệp THPT
Xem chi tiết 2 K lượt xem 6 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 16)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35. Do you feel like your teenager is spending most of the day glued to a phone screen? You're not too far off. A new survey from the Pew Research Center reveals the surprising ways that technology intersects with teen friendships — and the results show that 57 percent of teens have made at least one new friend online. Even more surprisingly, only 20 percent of those digital friends ever meet in person. While teens do connect with their friends face-to-face outside of school, they spend 55 percent of their day texting with friends, and only 25 percent of teens are spending actual time with their friends on a daily basis (outside of school hallways). These new forms of communication are key in maintaining friendships day-to-day — 27 percent of teens instant message their friends every day, 23 percent connect through social media every day, and 7 percent even video chat daily. Text messaging remains the main form of communication — almost half of survey respondents say it's their chosen method of communication with their closest friend. While girls are more likely to text with their close friends, boys are meeting new friends (and maintaining friendships) in the gaming world-89 percent play with friends they know, and 54 percent play with online-only friends. Whether they're close with their teammates or not, online garners say that playing makes them feel "more connected" to friends they know, or garners they've never met. When making new friends, social media has also become a major part of the teenage identity-62 percent of teens are quick to share their social media usernames when connecting with a new friend (although 80 percent still consider their phone number the best method of contact). Despite the negative consequences-21 percent of teenage users feel worse about their lives because of posts they see on social media — teens also have found support and connection through various platforms. In fact, 68 percent of teens received support during a challenging time in their lives via social media platforms. Just as technology has become a gateway for new friendships, or a channel to stay connected with current friends, it can also make a friendship breakup more public. The study reveals that girls are more likely to block or unfriend former allies, and 68 percent of all teenage users report experiencing "drama among their friends on social media." Question 32: The word "they" in paragraph 3 refers to ________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.5 K lượt xem 6 năm trước
ĐỀ LUYỆN TỔNG HỢP (P6)

Este X có công thức phân tử C4H6O2. Thủy phân hoàn toàn X bằng dung dịch NaOH, thu được dung dịch Y chứa hai chất đều có khả năng tham gia phản ứng tráng bạc. Chất X có công thức cấu tạo nào dưới đây?

Hóa học Tốt nghiệp THPT
Xem chi tiết 463 lượt xem 6 năm trước
230 Bài tập thí nghiệm Hóa Học cực hay có đáp án(Đề số 3)

Tiến hành phản ứng khử oxit X thành kim loại bằng khí H2 dư theo sơ đồ hình vẽ: Oxit X không thể là

Hóa học Tốt nghiệp THPT
Xem chi tiết 1.1 K lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 51 to 60.   Throughout history, women have had responsibility for healing the sick. However, it is only in comparative recent times that they have been allowed to train as doctors at medical schools in Britain. Yet in that short time, they have (37) _________ an enormous contribution to modem medicine.   The first female doctors were nuns (38) ________                         gave advice about diseases and (39) ________ and prepared medicines. In ancient Rome, women healers were considered skillful and respected. In Britain, for centuries, male doctors were suspicious of women who practised medicine (40) _________ and in 1512 a law was passed making it illegal for them to do so. Women couldn’t study medicine at universities (41) ____________ the 19th century and they only began to gain equality with male doctors in the 20th century. Điền vào số 38

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 752 lượt xem 6 năm trước
Bài 4: Khái niệm hai tam giác đồng dạng

Cho tam giác ABC. Hãy vẽ một tam giác đồng dạng với tam giác ABC theo tỉ số 1/2.

Toán Lớp 8
Xem chi tiết 1.7 K lượt xem 6 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 16)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35. Do you feel like your teenager is spending most of the day glued to a phone screen? You're not too far off. A new survey from the Pew Research Center reveals the surprising ways that technology intersects with teen friendships — and the results show that 57 percent of teens have made at least one new friend online. Even more surprisingly, only 20 percent of those digital friends ever meet in person. While teens do connect with their friends face-to-face outside of school, they spend 55 percent of their day texting with friends, and only 25 percent of teens are spending actual time with their friends on a daily basis (outside of school hallways). These new forms of communication are key in maintaining friendships day-to-day — 27 percent of teens instant message their friends every day, 23 percent connect through social media every day, and 7 percent even video chat daily. Text messaging remains the main form of communication — almost half of survey respondents say it's their chosen method of communication with their closest friend. While girls are more likely to text with their close friends, boys are meeting new friends (and maintaining friendships) in the gaming world-89 percent play with friends they know, and 54 percent play with online-only friends. Whether they're close with their teammates or not, online garners say that playing makes them feel "more connected" to friends they know, or garners they've never met. When making new friends, social media has also become a major part of the teenage identity-62 percent of teens are quick to share their social media usernames when connecting with a new friend (although 80 percent still consider their phone number the best method of contact). Despite the negative consequences-21 percent of teenage users feel worse about their lives because of posts they see on social media — teens also have found support and connection through various platforms. In fact, 68 percent of teens received support during a challenging time in their lives via social media platforms. Just as technology has become a gateway for new friendships, or a channel to stay connected with current friends, it can also make a friendship breakup more public. The study reveals that girls are more likely to block or unfriend former allies, and 68 percent of all teenage users report experiencing "drama among their friends on social media." Question 31: The following sentences are true, EXCEPT ___________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 7.6 K lượt xem 6 năm trước
ĐỀ LUYỆN TỔNG HỢP (P6)

Cho phản ứng sau: Anken (CnH2n) + KMnO4 + H2O → CnH2n(OH)2 + KOH + MnO2. Nhận xét nào sau đây không đúng ?

Hóa học Tốt nghiệp THPT
Xem chi tiết 2.6 K lượt xem 6 năm trước
230 Bài tập thí nghiệm Hóa Học cực hay có đáp án(Đề số 3)

Tiến hành điều chế Fe(OH)2 theo các bước sau: Ø Bước 1: Cho đinh sắt đã đánh thật sạch vào ống nghiệm (1). Cho 3 – 4 ml dung dịch HCl loãng vào, đun nóng nhẹ. Ø Bước 2: Đun sôi 4 – 5 ml dung dịch NaOH trong ống nghiệm (2). Ø Bước 3: Rót nhanh 2 – 3 ml dung dịch thu được ở bước 1 vào dung dịch NaOH, ghi nhận ngay màu kết tủa quan sát được. Ø Bước 4: Ghi nhận màu kết tủa quan sát được ở cuối buổi thí nghiệm. Cho các phát biểu sau: 1.     a) Sau bước 1, thu được chất khí không màu và dung dịch có màu vàng nhạt. 2.     b) Mục đích chính của bước 2 là đẩy khí O2 hòa tan có trong dung dịch NaOH. 3.     c) Sau bước 3, thu được kết tủa màu trắng hơi xanh. 4.     d) Ở bước 4, thu được kết tủa màu nâu đỏ. Số phát biểu đúng là

Hóa học Tốt nghiệp THPT
Xem chi tiết 2.2 K lượt xem 6 năm trước
Bài 4: Khái niệm hai tam giác đồng dạng

ΔA'B'C'  ΔA''B''C'' theo tỉ số đồng dạng k1, ΔA''B''C'' ΔABC theo tỉ số đồng dạng k2. Hỏi tam giác A'B'C' đồng dạng với tam giác ABC theo tỉ số nào?

Toán Lớp 8
Xem chi tiết 17.9 K lượt xem 1 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 51 to 60.   Throughout history, women have had responsibility for healing the sick. However, it is only in comparative recent times that they have been allowed to train as doctors at medical schools in Britain. Yet in that short time, they have (37) _________ an enormous contribution to modem medicine.   The first female doctors were nuns (38) ________                         gave advice about diseases and (39) ________ and prepared medicines. In ancient Rome, women healers were considered skillful and respected. In Britain, for centuries, male doctors were suspicious of women who practised medicine (40) _________ and in 1512 a law was passed making it illegal for them to do so. Women couldn’t study medicine at universities (41) ____________ the 19th century and they only began to gain equality with male doctors in the 20th century. Điền vào số 37

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.3 K lượt xem 6 năm trước
229 Bài tập thí nghiệm từ đề thi đại học cực hay có lời giải(P7)

Thực hiện các thí nghiệm sau: (a) Nhiệt phân NaNO3;                                 (b) Đốt cháy NH3 trong khí O2 (xúc tác Pt); (c) Sục khí CO2 vào dung dịch Na2SiO3;       (d) Cho SiO2 vào dung dịch HCl. Số thí nghiệm xảy ra phản ứng oxi hóa – khử là

Hóa học Tốt nghiệp THPT
Xem chi tiết 582 lượt xem 6 năm trước
230 Bài tập thí nghiệm Hóa Học cực hay có đáp án(Đề số 3)

Kết quả thí nghiệm của các dung dịch X, Y, Z, T với thuốc thử được ghi ở bảng sau:                           Mẫu thử Thuốc thử X Y Z T Dung dịch Ba(OH)2 Kết tủa trắng, sau đó tan ra Khí mùi khai và kết tủa trắng Có khí mùi khai Có kết tủa nâu đỏ X, Y, Z, T lần lượt là

Hóa học Tốt nghiệp THPT
Xem chi tiết 549 lượt xem 6 năm trước
Bài 4: Khái niệm hai tam giác đồng dạng

Trong hai mệnh đề sau đây, mệnh đề nào đúng? Mệnh đề nào sai? a) Hai tam giác bằng nhau thì đồng dạng với nhau. b) Hai tam giác đồng dạng với nhau thì bằng nhau.

Toán Lớp 8
Xem chi tiết 3.5 K lượt xem 6 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 16)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35. Do you feel like your teenager is spending most of the day glued to a phone screen? You're not too far off. A new survey from the Pew Research Center reveals the surprising ways that technology intersects with teen friendships — and the results show that 57 percent of teens have made at least one new friend online. Even more surprisingly, only 20 percent of those digital friends ever meet in person. While teens do connect with their friends face-to-face outside of school, they spend 55 percent of their day texting with friends, and only 25 percent of teens are spending actual time with their friends on a daily basis (outside of school hallways). These new forms of communication are key in maintaining friendships day-to-day — 27 percent of teens instant message their friends every day, 23 percent connect through social media every day, and 7 percent even video chat daily. Text messaging remains the main form of communication — almost half of survey respondents say it's their chosen method of communication with their closest friend. While girls are more likely to text with their close friends, boys are meeting new friends (and maintaining friendships) in the gaming world-89 percent play with friends they know, and 54 percent play with online-only friends. Whether they're close with their teammates or not, online garners say that playing makes them feel "more connected" to friends they know, or garners they've never met. When making new friends, social media has also become a major part of the teenage identity-62 percent of teens are quick to share their social media usernames when connecting with a new friend (although 80 percent still consider their phone number the best method of contact). Despite the negative consequences-21 percent of teenage users feel worse about their lives because of posts they see on social media — teens also have found support and connection through various platforms. In fact, 68 percent of teens received support during a challenging time in their lives via social media platforms. Just as technology has become a gateway for new friendships, or a channel to stay connected with current friends, it can also make a friendship breakup more public. The study reveals that girls are more likely to block or unfriend former allies, and 68 percent of all teenage users report experiencing "drama among their friends on social media." Question 30: According to the passage, what percentage of teens spend actual time with their friends?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 7.8 K lượt xem 6 năm trước
Bài 4: Khái niệm hai tam giác đồng dạng

Cho tam giác ABC. Kẻ đường thẳng a song song với cạnh BC và cắt hai cạnh AB, AC theo thứ tự tại M và N. Hai tam giác AMN và ABC có các góc và các cạnh tương ứng như thế nào ?

Toán Lớp 8
Xem chi tiết 6.1 K lượt xem 1 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.   After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75, 000, and the trend of lower enrollment rates is expected to continue.           There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question: "Is an MBA degree really what I need to be best prepared for getting a good job?". The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. The phrase “trend of” in line 5 is closest in meaning to which of the following?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.5 K lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Sinh học cực hay có lời giải chi tiết (đề số 25)

Cơ thể có kiểu gen AbaBDd, nếu tần số hoán vị gen là 8%, quá trình giảm phân bình thường, thì tỉ lệ các loại giao tử hoán vị của cơ thể này là: 

Sinh học Tốt nghiệp THPT
Xem chi tiết 271 lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Sinh học cực hay có lời giải chi tiết (đề số 25)

Sơ đồ phả hệ sau đây mô tả một bệnh di truyền ở người do một trong hai alen của một gen quy định Biết rằng không phát sinh đột biến mới ở tất cả các cá thể trong phả hệ. Xác suất sinh con đầu lòng bị bệnh này của cặp vợ chồng III.13 – III.14 là:  

Sinh học Tốt nghiệp THPT
Xem chi tiết 381 lượt xem 6 năm trước
Bài 4: Khái niệm hai tam giác đồng dạng

Nếu ΔA’B’C’ = ΔABC thì tam giác A’B’C’ có đồng dạng với tam giác ABC không ? Tỉ số đồng dạng là bao nhiêu ?

Toán Lớp 8
Xem chi tiết 8.6 K lượt xem 1 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.   After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75, 000, and the trend of lower enrollment rates is expected to continue.           There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question: "Is an MBA degree really what I need to be best prepared for getting a good job?". The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. The word “struggling” as used in the last sentence is closest in meaning to   .

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.8 K lượt xem 6 năm trước
230 Bài tập thí nghiệm Hóa Học cực hay có đáp án(Đề số 3)

Tiến hành các thí nghiệm sau: (a) Cho Fe(NO3)2 vào dung dịch AgNO3. (b) Sục khí Cl2 vào dung dịch FeCl2. (c) Dẫn khí CO dư qua bột MgO nung nóng.  (d) Cho Na vào dung dịch Cu(NO3)2 dư. (e) Nhiệt phân tinh thể NH4NO2. (g) Cho Cu vào dung dịch H2SO4 đặc, nóng dư. (h) Điện phân dung dịch NaCl với điện cực trơ, có màng ngăn xốp. Sau khi kết thúc các phản ứng, số thí nghiệm thu được đơn chất là

Hóa học Tốt nghiệp THPT
Xem chi tiết 1.2 K lượt xem 6 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 16)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35. Do you feel like your teenager is spending most of the day glued to a phone screen? You're not too far off. A new survey from the Pew Research Center reveals the surprising ways that technology intersects with teen friendships — and the results show that 57 percent of teens have made at least one new friend online. Even more surprisingly, only 20 percent of those digital friends ever meet in person. While teens do connect with their friends face-to-face outside of school, they spend 55 percent of their day texting with friends, and only 25 percent of teens are spending actual time with their friends on a daily basis (outside of school hallways). These new forms of communication are key in maintaining friendships day-to-day — 27 percent of teens instant message their friends every day, 23 percent connect through social media every day, and 7 percent even video chat daily. Text messaging remains the main form of communication — almost half of survey respondents say it's their chosen method of communication with their closest friend. While girls are more likely to text with their close friends, boys are meeting new friends (and maintaining friendships) in the gaming world-89 percent play with friends they know, and 54 percent play with online-only friends. Whether they're close with their teammates or not, online garners say that playing makes them feel "more connected" to friends they know, or garners they've never met. When making new friends, social media has also become a major part of the teenage identity-62 percent of teens are quick to share their social media usernames when connecting with a new friend (although 80 percent still consider their phone number the best method of contact). Despite the negative consequences-21 percent of teenage users feel worse about their lives because of posts they see on social media — teens also have found support and connection through various platforms. In fact, 68 percent of teens received support during a challenging time in their lives via social media platforms. Just as technology has become a gateway for new friendships, or a channel to stay connected with current friends, it can also make a friendship breakup more public. The study reveals that girls are more likely to block or unfriend former allies, and 68 percent of all teenage users report experiencing "drama among their friends on social media." Question 29: The word "digital" in the first paragraph is closest in meaning to _______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 7.3 K lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.   After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75, 000, and the trend of lower enrollment rates is expected to continue.           There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question: "Is an MBA degree really what I need to be best prepared for getting a good job?". The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. According to the passage, what are two causes of declining business school enrollments?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 3.3 K lượt xem 6 năm trước
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 16)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 35. Do you feel like your teenager is spending most of the day glued to a phone screen? You're not too far off. A new survey from the Pew Research Center reveals the surprising ways that technology intersects with teen friendships — and the results show that 57 percent of teens have made at least one new friend online. Even more surprisingly, only 20 percent of those digital friends ever meet in person. While teens do connect with their friends face-to-face outside of school, they spend 55 percent of their day texting with friends, and only 25 percent of teens are spending actual time with their friends on a daily basis (outside of school hallways). These new forms of communication are key in maintaining friendships day-to-day — 27 percent of teens instant message their friends every day, 23 percent connect through social media every day, and 7 percent even video chat daily. Text messaging remains the main form of communication — almost half of survey respondents say it's their chosen method of communication with their closest friend. While girls are more likely to text with their close friends, boys are meeting new friends (and maintaining friendships) in the gaming world-89 percent play with friends they know, and 54 percent play with online-only friends. Whether they're close with their teammates or not, online garners say that playing makes them feel "more connected" to friends they know, or garners they've never met. When making new friends, social media has also become a major part of the teenage identity-62 percent of teens are quick to share their social media usernames when connecting with a new friend (although 80 percent still consider their phone number the best method of contact). Despite the negative consequences-21 percent of teenage users feel worse about their lives because of posts they see on social media — teens also have found support and connection through various platforms. In fact, 68 percent of teens received support during a challenging time in their lives via social media platforms. Just as technology has become a gateway for new friendships, or a channel to stay connected with current friends, it can also make a friendship breakup more public. The study reveals that girls are more likely to block or unfriend former allies, and 68 percent of all teenage users report experiencing "drama among their friends on social media." Question 28: What is the main idea of the passage?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 64.4 K lượt xem 6 năm trước
Bài 4: Khái niệm hai tam giác đồng dạng

Cho hai tam giác ABC và A’B’C’ (h.29) Nhìn vào hình vẽ hãy viết các cặp góc bằng nhau. Tính các tỉ số A'B'AB; B'C'BC; C'A'CA rồi so sánh các tỉ số đó

Toán Lớp 8
Xem chi tiết 2.9 K lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.   After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75, 000, and the trend of lower enrollment rates is expected to continue.           There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question: "Is an MBA degree really what I need to be best prepared for getting a good job?". The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. Which of the following descriptions most likely applies to Wall Street?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.5 K lượt xem 6 năm trước
ĐỀ LUYỆN TỔNG HỢP (P6)

Phát biểu nào sau đây sai?

Hóa học Tốt nghiệp THPT
Xem chi tiết 1.6 K lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.   After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75, 000, and the trend of lower enrollment rates is expected to continue.   There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question: "Is an MBA degree really what I need to be best prepared for getting a good job?". The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. Which of the following business schools has NOT shown a decrease in enrollment?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 511 lượt xem 6 năm trước
ĐỀ LUYỆN TỔNG HỢP (P6)

Nhiệt độ sôi của 4 chất hữu cơ HCOOH, C3H8, C2H5OH và CH3COOH (không theo thứ tự) là: -42oC, 118oC, 100,5oC và 78,3oC. Nhiệt độ sôi của HCOOH là:

Hóa học Tốt nghiệp THPT
Xem chi tiết 6.3 K lượt xem 6 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 5)

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.   After two decades of growing student enrollments and economic prosperity, business schools in the United States have started to face harder times. Only Harvard's MBA School has shown a substantial increase in enrollment in recent years. Both Princeton and Stanford have seen decreases in their enrollments. Since 1990, the number of people receiving Masters in Business Administration (MBA) degrees, has dropped about 3 percent to 75, 000, and the trend of lower enrollment rates is expected to continue.           There are two factors causing this decrease in students seeking an MBA degree. The first one is that many graduates of four-year colleges are finding that an MBA degree does not guarantee a plush job on Wall Street, or in other financial districts of major American cities. Many of the entry-level management jobs are going to students graduating with Master of Arts degrees in English and the humanities as well as those holding MBA degrees. Students have asked the question: "Is an MBA degree really what I need to be best prepared for getting a good job?". The second major factor has been the cutting of American payrolls and the lower number of entry-level jobs being offered. Business needs are changing, and MBA schools are struggling to meet the new demands. The word “plush” in line 8 most probably means ___________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.8 K lượt xem 6 năm trước
Luyện tập trang 68

Hình 27 cho biết có 6 góc bằng nhau: Kích thước các đoạn thẳng đã được ghi trên hình. Hãy thiết lập những giá trị từ các kích thước đã cho.

Toán Lớp 8
Xem chi tiết 2 K lượt xem 1 năm trước

Đăng ký

Bạn đã có tài khoản?

CÔNG TY TNHH ĐẦU TƯ VÀ DỊCH VỤ GIÁO DỤC VIETJACK
Giấy chứng nhận ĐKKD số: 0108307822 do Sở KH & ĐT TP Hà Nội cấp lần đầu ngày 04/06/2018
© 2017 Vietjack87. All Rights Reserved.
zalo Nhắn tin Zalo Hỏi bài tập