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.
The author of the passage states that the amount of acid produced by the bacteria in your saliva increases _________.
A. with the amount of sweets you eat
B. with the number of times you eat sweets
C. if you eat sweets with your meals
D. if you eat sticky sweets
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Chọn đáp án B
Tác giả của bài đọc nói rằng lượng axit do vi khuẩn tiết ra trong nước bọt tăng lên _________.
A. cùng với lượng đồ ngọt mà bạn ăn
B. cùng với số lần bạn ăn đồ ngọt
C. nếu bạn ăn đồ ngọt cùng với các bữa ăn
D. nếu bạn ăn đồ ngọt dẻo
Dẫn chứng: The number of times you eat sweets rather than the total amount determines how much harmful acid the bacteria in your saliva produce. (Số lần bạn ăn đồ ngọt quyết định có bao nhiêu axit gây hại do vi khuẩn tiết ra trong nước bọt của bạn.)
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: “ _________ ”
Prices are increasing dramatically in big cities. The _________ seems to go up every day.
The boy quickly _________ the old woman’s telephone number to memory.
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Sometimes what is best for society is not always good for an individual living in that society.
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.
I’ll back up your ideas if they don’t believe you.
_________ people are those who share the same interests, or points of view.
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.
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 23 to 27.
After winter months, the days become longer, the buds (23) _________ in the trees, birds sing, and the world (24) _________ a green dress. Spring passes (25) _________summer. Everyone knows that summer will not (26) _________. The power of all the wisest men and women in the world cannot keep it for us. The com becomes ripe, the leaves turn brown and then drop to the ground, (27) _________ the world changes its green dress for a dress of autumn colors.
Điền vào số (23)
We should make full _________of renewable sources of energy such as wind and solar power in the world.
