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 44 to 50. The 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 ...
Nguyễn Thu Hiền | Chat Online | |
06/09 15:18:58 (Tiếng Anh - Lớp 12) |
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 44 to 50.
The 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.
What does this passage mainly discuss?
Lựa chọn một trả lời để xem Đáp án chính xác Báo sai đáp án hoặc câu hỏi |
A. Good nutrition 0 % | 0 phiếu |
B. Food with fiber 0 % | 0 phiếu |
C. Ways to keep your teeth healthy 0 % | 0 phiếu |
D. Fluoridization and cavities 0 % | 0 phiếu |
Tổng cộng: | 0 trả lời |
Trắc nghiệm liên quan
- 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 44 to 50. The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid ... (Tiếng Anh - Lớp 12)
- 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 44 to 50. The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid ... (Tiếng Anh - Lớp 12)
- 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 44 to 50. The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid ... (Tiếng Anh - Lớp 12)
- 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 44 to 50. The cause of tooth decay is acid, which is produced by bacteria in the mouth. The acid ... (Tiếng Anh - Lớp 12)
- 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 39 to 43. It used to be that people would drink coffee or tea in the morning to pick them up and get ... (Tiếng Anh - Lớp 12)
- 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 39 to 43. It used to be that people would drink coffee or tea in the morning to pick them up and get ... (Tiếng Anh - Lớp 12)
- 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 39 to 43. It used to be that people would drink coffee or tea in the morning to pick them up and get ... (Tiếng Anh - Lớp 12)
- 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 39 to 43. It used to be that people would drink coffee or tea in the morning to pick them up and get ... (Tiếng Anh - Lớp 12)
- 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 39 to 43. It used to be that people would drink coffee or tea in the morning to pick them up and get ... (Tiếng Anh - Lớp 12)
- 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 34 to 38. In European and North American cultures, body language behaviors ... (Tiếng Anh - Lớp 12)
Trắc nghiệm mới nhất
- Read the following passage and choose the letter A, B, C, or D to fill in each of the numbered blanks. (1.25pts) English has been called (26)________ international language for more than a century. The number of people (27) ________ speak English as ... (Tiếng Anh - Lớp 10)
- We live in a mountain area in the north-west of the country in Viet Nam. (Tiếng Anh - Lớp 10)
- Billy enjoys dance but his parents are making him join the school football team. (Tiếng Anh - Lớp 10)
- Choose the letter A, B, C, or D that needs correction in each of the following questions. (0.75pt) Chemistry are considered as a difficult subject by many students. (Tiếng Anh - Lớp 10)
- The weather is nice and my friend will go to her farm to pick strawberries. (Tiếng Anh - Lớp 10)
- Choose the letter A, B, C, or D which is closest in meaning to each of the following questions. (0.5pt) My children have carried the chairs into the house. (Tiếng Anh - Lớp 10)
- Many young people move to big cities to _______ a good career. (Tiếng Anh - Lớp 10)
- We are going to spend our holiday _______ rural England. (Tiếng Anh - Lớp 10)
- Mary said that she _______ go shopping with me. (Tiếng Anh - Lớp 10)
- I and my younger sister _______ English since we were in grade 3. (Tiếng Anh - Lớp 10)