Câu hỏi:

15/03/2020 631

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 35 to 42.

        The main cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid removes minerals from tooth enamel, allowing tooth decay to begin; the saliva in your mouth encourages remineralization and neutralizes the acid. The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been “primed” by frequent exposure to sugar. To keep your teeth healthy, a regular dental hygiene program should be followed.

        Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. If fluoride is present in drinking water when teeth are forming, some fluoride is incorporated into the enamel of the teeth, making them more resistant to attack by acid. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.

                   In addition to a regular dental hygiene program, a good way to keep your teeth healthy is to reduce your intake of sweet food. The least cavity-causing way to eat sweets is to have them with meals and not between. The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. But the amount of sweets influences the quality of your saliva. Avoid, if you can, sticky sweets that stay in your mouth a long time. Also try to brush and floss your teeth after eating sugary foods. Even rinsing your mouth with water is effective. Whenever possible, eat foods with fiber, such as raw carrot sticks, apples, celery sticks, etc., that scrape off plaque, acting as a toothbrush. Cavities can be greatly reduced if these rules are followed when eating sweets.

According to the passage, all of the following statements about plaque are true EXCEPT _________.

A. It consists of acid producing bacteria

B. It is not affected by eating sweets

C. It can be removed from teeth by brushing and flossing

D. It reduces the positive effect of saliva

Xem lời giải

Câu hỏi trong đề: 20 Đề thi thử THPTQG môn Tiếng Anh cực hay có đáp án !!

Bắt đầu thi

Trả lời:

Giải bởi Vietjack

Chọn đáp án B

Theo bài đọc, tất cả những điều sau đây đều đúng về cao răng NGOẠI TRỪ _________

A. Nó có chứa các loại vi khuẩn tiết ra axit

B. Nó không bị ảnh hưởng bởi việc ăn đồ ngọt

C. Nó có thể được loại bỏ ra khỏi răng bằng việc đánh răng và dùng chỉ nha khoa

D. Nó giảm tác dụng tích cực của nước bọt

Dẫn chứng:

- The rate at which bacteria in the mouth produce acid depends on the amount of plaque on the teeth, the composition of the microbial flora, and whether the bacteria of the plaque have been “primed” by frequent exposure to sugar. (Tỉ lệ vi khuẩn trong miệng tiết ra axit phụ thuộc vào lượng cao răng, thành phần của hệ vi khuẩn, và vào việc vi khuẩn của cao răng có được “phát triển” bởi việc tiếp xúc thường xuyên với đường hay không.” => A đúng, B sai

- Removing plaque with a toothbrush and dental floss temporarily reduces the numbers of bacteria in the mouth and thus reduces tooth decay. It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions. (Loại bỏ cao răng bằng việc đánh răng và dùng chỉ nha khoa tạm thời làm giảm số lượng vi khuẩn trong miệng và do đó giảm được sâu răng. Điều đó cũng làm cho bề mặt răng dễ tiếp cận hơn, cho phép nước bọt trung hòa axit và bù khoáng cho các tổn thương.)

=> C, D đúng.

Bình luận

Câu 1:

Mr Nam knows Hanoi City like the back of his _________. He used to be a taxi driver there for 10 years.

A. head

B. mind

C. hand

D. life

Xem đáp án » 23/03/2020 115,501

Câu 2:

The government should take some measures to _________ that tourism develops in harmony with the environment.

A. promote

B. ensure

C. facilitate

D. improve

Xem đáp án » 23/03/2020 93,458

Câu 3:

Marry is talking to Linda over the phone.

Mary: “Thank you for helping me prepare for the party.”

Linda: “_________”.

A. My pleasure

B. The meal was out of this world

C. Never mention me.

D. Of course not

Xem đáp án » 23/03/2020 59,286

Câu 4:

Tom is in Ho Chi Minh City and asks a passer-by the way to the railway station.

Tom: “Can you show me the way to the railway station, please?”

- Passer-by: “ _________ ”

A. No way.

B. Just round the comer over there.

C. Look it up in a dictionary!

D. There’s no traffic near here.

Xem đáp án » 23/03/2020 42,098

Câu 5:

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

According to (A) most medical experts, massage (B) relieves pain and anxiety, eases depression and (C) speeding up recovery from (D) illnesses.

A. most medical experts

B. relieves

C. speeding up

D. illnesses

Xem đáp án » 23/03/2020 23,378

Câu 6:

Although she is my sister, I find it hard to _________ her selfishness.

A. put up with

B. catch up with

C. keep up with

D. come down with

Xem đáp án » 23/03/2020 23,228

Câu 7:

The boy quickly _________ the old woman’s telephone number to memory.

A. devoted

B. added

C. committed

D. admitted

Xem đáp án » 23/03/2020 21,948

Bình luận

Mr Nam knows Hanoi City like the back of his _________. He used to be a taxi driver there for 10 years.

The government should take some measures to _________ that tourism develops in harmony with the environment.

Marry is talking to Linda over the phone.

Mary: “Thank you for helping me prepare for the party.”

Linda: “_________”.

Tom is in Ho Chi Minh City and asks a passer-by the way to the railway station.

Tom: “Can you show me the way to the railway station, please?”

- Passer-by: “ _________ ”

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

According to (A) most medical experts, massage (B) relieves pain and anxiety, eases depression and (C) speeding up recovery from (D) illnesses.

Although she is my sister, I find it hard to _________ her selfishness.

The boy quickly _________ the old woman’s telephone number to memory.

VIP +1 tháng ( 199,000 VNĐ )

VIP +3 tháng ( 299,000 VNĐ )

VIP +6 tháng ( 399,000 VNĐ )

VIP +12 tháng ( 499,000 VNĐ )

🔥 Đề thi HOT:

Bình luận

Mr Nam knows Hanoi City like the back of his _________. He used to be a taxi driver there for 10 years.

The government should take some measures to _________ that tourism develops in harmony with the environment.

Marry is talking to Linda over the phone. Mary: “Thank you for helping me prepare for the party.” Linda: “_________”.

Tom is in Ho Chi Minh City and asks a passer-by the way to the railway station. Tom: “Can you show me the way to the railway station, please?” - Passer-by: “ _________ ”

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. According to (A) most medical experts, massage (B) relieves pain and anxiety, eases depression and (C) speeding up recovery from (D) illnesses.

Although she is my sister, I find it hard to _________ her selfishness.

The boy quickly _________ the old woman’s telephone number to memory.

VIP +1 tháng ( 199,000 VNĐ )

VIP +3 tháng ( 299,000 VNĐ )

VIP +6 tháng ( 399,000 VNĐ )

VIP +12 tháng ( 499,000 VNĐ )

🔥 Đề thi HOT:

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Marry is talking to Linda over the phone.

Mary: “Thank you for helping me prepare for the party.”

Linda: “_________”.

Tom is in Ho Chi Minh City and asks a passer-by the way to the railway station.

Tom: “Can you show me the way to the railway station, please?”

- Passer-by: “ _________ ”

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

According to (A) most medical experts, massage (B) relieves pain and anxiety, eases depression and (C) speeding up recovery from (D) illnesses.