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15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies.Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee in 1796, for example, some varieties of half dimes, dimes, and halfdollars were produced with sixteen stars.As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each of the original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die break and is not a true error. Why was a coin produced in 1828 with only twelve stars?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 504 lượt xem 6 năm trước
Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 22)

Bằng chứng nào sau đây không được xem là bằng chứng sinh học phân tử?

Sinh học Tốt nghiệp THPT
Xem chi tiết 761 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies.Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee in 1796, for example, some varieties of half dimes, dimes, and halfdollars were produced with sixteen stars.As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each of the original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die break and is not a true error. Which of the following is NOT mentioned as the denomination of an American coin?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 3.9 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies.Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee in 1796, for example, some varieties of half dimes, dimes, and halfdollars were produced with sixteen stars.As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each of the original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die break and is not a true error. Which of the following can be inferred about the order in which Kentucky, Tennessee, and Vermont joined the Union?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 292 lượt xem 6 năm trước
Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 22)

Giả sử trong một tế bào sinh tinh có bộ nhiễm sắc thể được kí hiệu là 44A + XY. Khi tế bào này giảm phân các cặp nhiễm sắc thể thường phân li bình thường, cặp nhiễm sắc thể giới tính không phân li trong giảm phân I; giảm phân II diễn ra bình thường. Các loại giao tử có thể được tạo ra từ quá trình giảm phân của tế bào trên là:

Sinh học Tốt nghiệp THPT
Xem chi tiết 13.6 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.It can be inferred from the passage that if an item contains more carbon-14 than nitrogen-14, then the item is______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 0.9 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies.Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee in 1796, for example, some varieties of half dimes, dimes, and halfdollars were produced with sixteen stars.As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each of the original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die break and is not a true error. The expression “Curiously enough” is used because the author finds it strange that _______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 575 lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Xenlulozơ trinitrat được điều chế từ xenlulozơ và axit nitric đậm đặc có H2SO4 đặc, nóng xúc tác. Để có 29,7 kg xenlulozơ trinitrat cần dùng dung dịch chứa m kg axit nitric, hiệu suất phản ứng đạt 90%. Giá trị của m là

Hóa học Tốt nghiệp THPT
Xem chi tiết 444 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies.Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee in 1796, for example, some varieties of half dimes, dimes, and halfdollars were produced with sixteen stars.As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each of the original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die break and is not a true error. The word “bore” in line 3 is closest in meaning to ________.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 326 lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.The paragraph following the passage most probably discusses______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 544 lượt xem 6 năm trước
Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 22)

Có những cấu trúc, những đặc điểm và những quá trình liên quan đến trao đổi khí:1. hêmôglôbin và các sắc tố hô hấp khác2. bề mặt mỏng và ẩm ướt3. khuếch tán4. hồng cầu5. phổi và mangNhững cấu trúc, những đặc điểm và những quá trình cần thiết cho trao đổi khí ở tất cả các loài động vật là:

Sinh học Tốt nghiệp THPT
Xem chi tiết 3.3 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies.Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee in 1796, for example, some varieties of half dimes, dimes, and halfdollars were produced with sixteen stars.As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each of the original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die break and is not a true error. The word “their” in line 1 refers to _______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 384 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Stars have been significant features in the design of many United States coins and their number has varied from one to forty-eight stars. Most of the coins issued from about 1799 to the early years of the twentieth century bore thirteen stars representing the thirteen original colonies.Curiously enough, the first American silver coins, issued in 1794, had fifteen stars because by that time Vermont and Kentucky has joined the Union. At that time it was apparently the intention of mint officials to add a star for each new state. Following the admission of Tennessee in 1796, for example, some varieties of half dimes, dimes, and halfdollars were produced with sixteen stars.As more states were admitted to the Union, however, it quickly became apparent that this scheme would not prove practical and the coins from A798 on were issued with only thirteen stars-one for each of the original colonies. Due to an error at the mint, one variety of the A828 half cent was issued with only twelve stars. There is also a variety of the large cent with only A2 stars, but this is the result of a die break and is not a true error. What is the main topic of the passage?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 321 lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.It is implied in the passage that______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.5 K lượt xem 6 năm trước
Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 22)

Trong cơ chế điều hoà hoạt động của gen ở vi khuẩn E.coli, prôtêin ức chế ngăn cản quá trình phiên mã bằng cách:

Sinh học Tốt nghiệp THPT
Xem chi tiết 0.9 K lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Dãy gồm các chất đều tác dụng với AgNO3 trong dung dịch NH3, là

Hóa học Tốt nghiệp THPT
Xem chi tiết 1.9 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.The word “roughly” in paragraph 2 is closest in meaning to______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 527 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions.Face-to-face conversation is a two-way process. You speak to me, I reply to you and so on. Two-way (23)_______depends on having a coding system that is understood by both sender and (24)_______, and an agreed convention about signaling the beginning and end of the message. In speech, the coding system is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to mention. In fact, the signals (25)_______ in conversation and meetings are often (26)_______. For example, lowering the pitch of the voice may mean the end of a sentence, a sharp intake of breath may signal the desire to interrupt, catching the chairman’s eye may indicate the desire to speak in a formal setting like a debate, a clenched fist may indicate anger. When (27)_______ visual signals are not possible, more formal signals may be needed.Điền vào ô 25

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.4 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions.Face-to-face conversation is a two-way process. You speak to me, I reply to you and so on. Two-way (23)_______depends on having a coding system that is understood by both sender and (24)_______, and an agreed convention about signaling the beginning and end of the message. In speech, the coding system is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to mention. In fact, the signals (25)_______ in conversation and meetings are often (26)_______. For example, lowering the pitch of the voice may mean the end of a sentence, a sharp intake of breath may signal the desire to interrupt, catching the chairman’s eye may indicate the desire to speak in a formal setting like a debate, a clenched fist may indicate anger. When (27)_______ visual signals are not possible, more formal signals may be needed.Điền vào ô 25

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions.Face-to-face conversation is a two-way process. You speak to me, I reply to you and so on. Two-way (23)_______depends on having a coding system that is understood by both sender and (24)_______, and an agreed convention about signaling the beginning and end of the message. In speech, the coding system is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to mention. In fact, the signals (25)_______ in conversation and meetings are often (26)_______. For example, lowering the pitch of the voice may mean the end of a sentence, a sharp intake of breath may signal the desire to interrupt, catching the chairman’s eye may indicate the desire to speak in a formal setting like a debate, a clenched fist may indicate anger. When (27)_______ visual signals are not possible, more formal signals may be needed.Điền vào ô 25

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 13 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.The word “underlying” could best be replaced by______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 637 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions.Face-to-face conversation is a two-way process. You speak to me, I reply to you and so on. Two-way (23)_______depends on having a coding system that is understood by both sender and (24)_______, and an agreed convention about signaling the beginning and end of the message. In speech, the coding system is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to mention. In fact, the signals (25)_______ in conversation and meetings are often (26)_______. For example, lowering the pitch of the voice may mean the end of a sentence, a sharp intake of breath may signal the desire to interrupt, catching the chairman’s eye may indicate the desire to speak in a formal setting like a debate, a clenched fist may indicate anger. When (27)_______ visual signals are not possible, more formal signals may be needed.Điền vào ô 24

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.1 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Read the following passage and mark the letter A, B, C, D on your answer sheet to indicate the correct answer to each of the questions.Face-to-face conversation is a two-way process. You speak to me, I reply to you and so on. Two-way (23)_______depends on having a coding system that is understood by both sender and (24)_______, and an agreed convention about signaling the beginning and end of the message. In speech, the coding system is the language like English or Spanish; the convention that one person speaks at a time may seem too obvious to mention. In fact, the signals (25)_______ in conversation and meetings are often (26)_______. For example, lowering the pitch of the voice may mean the end of a sentence, a sharp intake of breath may signal the desire to interrupt, catching the chairman’s eye may indicate the desire to speak in a formal setting like a debate, a clenched fist may indicate anger. When (27)_______ visual signals are not possible, more formal signals may be needed.Điền vào ô 23

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 7.9 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

______hard, you will get good results in the coming examination.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 360 lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Thủy phân hoàn toàn H2N-CH2-CO-NH-CH(CH3)-CO-NH-CH(CH3)-CO-NH-CH2- CO-NH-CH2-COOH thu được bao nhiêu loại α-amino axit khác nhau?

Hóa học Tốt nghiệp THPT
Xem chi tiết 428 lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.The word “it” in paragraph 1 refers to______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 630 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Though built in 1946, computers were sold ______ for the first time in the 1950s

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 578 lượt xem 1 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

The man to _______ we have just talked is the Director General.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.1 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.Which of the following is NOT true about carbon-14?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.7 K lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Khối lượng của tinh bột cần dùng trong quá trình lên men để tạo thành 5 lít ancol etylic 46° là (biết hiệu suất của quá trình là 72% và khối lượng riêng của anc,etylic nguyên chất là 0,8 g/ml.

Hóa học Tốt nghiệp THPT
Xem chi tiết 553 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

He wanted to know whose car I borrowed _____.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 402 lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.           Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.This passage is mainly about______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 0.9 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Global warming is obviously _______ a worrying influence on the climate worldwide

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 397 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

An academic year in Vietnam is divided _____ two terms.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 11 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 36 to 42.Productivity Hacks for Great Success          No matter who we are or where we are from, we only have 24 hours each day to get things done. Some people seem to make the most of their time, using it to achieve their goals and dreams. Others feel that life is passing them by and they aren’t accomplishing anything. If you are in the latter group, it is not too late to turn things around. By implementing a few simple hacks, you can start getting better results very quickly.           If you want to become more productive, it pays to learn about the Pareto principle (which is also known as the 80-20 rule). It states that for most tasks, 80 percent of the results we get come from 20 percent of the work we do. For example. 80 percent of the company sales usually come from 20 percent of customers. Therefore, the trick is to focus your efforts on the key 20 percent of actions that truly matter to greatly improve your results.           In some cases, people may be busy from morning to night but still seem to get nothing done. In this situation, the problem might be that clear goals haven’t been set. To fix this, set some time aside to list the things you want to achieve in life. Then, select the top three or four that you want to focus on for the next year. Look at your goals every night before bedtime and ask yourself what are the next actions to accomplish each day. Then, promise yourself that you will finish these tasks no matter how busy you get. If possible try completing the tasks first thing in the morning so you are assured of success.           Another common mistake regarding productivity is not considering our energy levels. If we try to work around the clock, we will eventually get tired and quit. Everyone needs time to sleep, eat, socialize with friends, and unwind from the stress of the day. To make sure you don’t burn out, be sure to schedule some time for breaks and fun activities into your schedule every day. Finally, no matter how difficult your goals may seem, remember the old saying that “a journey of a thousand miles begins with a single step”.What is the Pareto principle?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

During the interview, you should try to ____ a good impression on your interview.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.3 K lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Dãy gồm các chất đều tác dụng với H2 (xúc tác Ni, t°), tạo ra sản phẩm thu được có khả năng phản ứng với Na là

Hóa học Tốt nghiệp THPT
Xem chi tiết 575 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Students are expected to write their homework slowly and _______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 369 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Whenever I have problems, Jane is always very dependable. She never ______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 524 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

The H5N1 infected patients have to _______ others to prevent the virus from spreading

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 565 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Jane got married_______ Peter two years ago, but now they have split.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.3 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 36 to 42.Productivity Hacks for Great Success          No matter who we are or where we are from, we only have 24 hours each day to get things done. Some people seem to make the most of their time, using it to achieve their goals and dreams. Others feel that life is passing them by and they aren’t accomplishing anything. If you are in the latter group, it is not too late to turn things around. By implementing a few simple hacks, you can start getting better results very quickly.           If you want to become more productive, it pays to learn about the Pareto principle (which is also known as the 80-20 rule). It states that for most tasks, 80 percent of the results we get come from 20 percent of the work we do. For example. 80 percent of the company sales usually come from 20 percent of customers. Therefore, the trick is to focus your efforts on the key 20 percent of actions that truly matter to greatly improve your results.           In some cases, people may be busy from morning to night but still seem to get nothing done. In this situation, the problem might be that clear goals haven’t been set. To fix this, set some time aside to list the things you want to achieve in life. Then, select the top three or four that you want to focus on for the next year. Look at your goals every night before bedtime and ask yourself what are the next actions to accomplish each day. Then, promise yourself that you will finish these tasks no matter how busy you get. If possible try completing the tasks first thing in the morning so you are assured of success.           Another common mistake regarding productivity is not considering our energy levels. If we try to work around the clock, we will eventually get tired and quit. Everyone needs time to sleep, eat, socialize with friends, and unwind from the stress of the day. To make sure you don’t burn out, be sure to schedule some time for breaks and fun activities into your schedule every day. Finally, no matter how difficult your goals may seem, remember the old saying that “a journey of a thousand miles begins with a single step”.Which of the following sentences is true?

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.2 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

The state school system is free for all students and _______ by the government.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 2.5 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. The purpose of this survey is to determine students’ attitudes toward love and marriage.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 6.6 K lượt xem 1 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions. In daily communication, you should know how to interpret other people’s body language.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.4 K lượt xem 6 năm trước
Tổng hợp đề thi thử THPT quốc gia môn tiếng anh có lời giải chi tiết (Đề số 9)

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 36 to 42.Productivity Hacks for Great Success          No matter who we are or where we are from, we only have 24 hours each day to get things done. Some people seem to make the most of their time, using it to achieve their goals and dreams. Others feel that life is passing them by and they aren’t accomplishing anything. If you are in the latter group, it is not too late to turn things around. By implementing a few simple hacks, you can start getting better results very quickly.           If you want to become more productive, it pays to learn about the Pareto principle (which is also known as the 80-20 rule). It states that for most tasks, 80 percent of the results we get come from 20 percent of the work we do. For example. 80 percent of the company sales usually come from 20 percent of customers. Therefore, the trick is to focus your efforts on the key 20 percent of actions that truly matter to greatly improve your results.           In some cases, people may be busy from morning to night but still seem to get nothing done. In this situation, the problem might be that clear goals haven’t been set. To fix this, set some time aside to list the things you want to achieve in life. Then, select the top three or four that you want to focus on for the next year. Look at your goals every night before bedtime and ask yourself what are the next actions to accomplish each day. Then, promise yourself that you will finish these tasks no matter how busy you get. If possible try completing the tasks first thing in the morning so you are assured of success.           Another common mistake regarding productivity is not considering our energy levels. If we try to work around the clock, we will eventually get tired and quit. Everyone needs time to sleep, eat, socialize with friends, and unwind from the stress of the day. To make sure you don’t burn out, be sure to schedule some time for breaks and fun activities into your schedule every day. Finally, no matter how difficult your goals may seem, remember the old saying that “a journey of a thousand miles begins with a single step”.he phrase “hacks for” in the title is closest in meaning to______.

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 666 lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. You should not wear casual clothes to the interview. The first impression is very important

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 1.7 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. My younger brothers are obedient most of the time, but they are quite mischievous sometimes

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 707 lượt xem 6 năm trước
Bộ đề luyện thi THPTQG Hóa Học cực hay có lời giải chi tiết (Đề số 11)

Phát biểu nào sau đây đúng khi nói về amin?

Hóa học Tốt nghiệp THPT
Xem chi tiết 1.5 K lượt xem 6 năm trước
15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 10)

Two people are talking on the phone. A. “Could I speak to Alex, please?” B. “_______.”

Tiếng Anh Tốt nghiệp THPT
Xem chi tiết 11.4 K lượt xem 6 năm trước

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