Câu hỏi:

15/03/2020 3,131

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.

We can infer from the passage that one benefit of fluoride to healthy teeth is _________ .

A. It strengthens tooth enamel

B. It stimulates saliva production

C. It makes teeth whiter

D. It is a replacement for brushing and flossing in dental care

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 A

Chúng ta có thể suy luận từ đoạn văn rằng một lợi ích của florua đối với răng chắc khỏe là _________.

A. Nó tăng cường men răng

B. Nó kích thích việc tiết nước bọt

C. Nó làm cho răng trắng hơn

D. Nó là sự thay thế cho việc đánh răng và dùng chỉ nha khoa trong việc chăm sóc răng miệng

Dẫn chứng: 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. (Nếu Florua có mặt trong nước uống khi răng đang hình thành thì một số florua sẽ được kết hợp vào men răng giúp chúng có khả năng chống lại sự tấn công của axit.)

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 115,502

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.

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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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Quên mật khẩu

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.