The cause of tooth decay is acid which is produced by bacter
Câu hỏi
Nhận biếtRead 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.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.
Câu 1: What does this passage mainly discuss?
A. Good nutrition
B. Food with fiber
C. ways to keep your teeth healthy
D. Fluoridization and cavities
Câu 2: The word “it” refers to .
A. dental floss
B. bacteria
C. removal of plaque
D. plaque
Câu 3: According to the passage, all of the following statements about plaque
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
Câu 4: 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
Câu 5: What can be concluded from the passage about sweets?
A. All sweets should be avoided.
B. Sweets should be eaten with care.
C. It is better to eat sweets a little at a time throughout the day.
D. Sticky sweets are less harmful than other sweets.
Câu 6: 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
Câu 7: The word "scrape off" is closest in meaning to .
A. repel
B. rub together with
C. remove
D. dissolve
Đáp án đúng:
Lời giải của Tự Học 365
Đáp án câu 1 là: CGiải chi tiết:
Giải thích:
Phần này chủ yếu thảo luận gì?
A. Dinh dưỡng tốt
B. Thực phẩm có chất xơ
C. Các cách để giữ cho răng của bạn khỏe mạnh
D. Flo hóa vfa sâu răng
Đáp án: C
Đáp án câu 2 là: CGiải chi tiết:
Giải thích:
Từ "it" dùng để chỉ_____
A. Chỉ nha khoa
B. vi khuẩn
C. loại bỏ mảng bám
B. mảng bám
Dẫn chứng: It also makes the surfaces of the teeth more accessible, enabling saliva to neutralize acid and remineralize lesions.
Đáp án: C
Đáp án câu 3 là: BGiải chi tiết:
Giải thích:
Theo đoạn văn này, tất cả các câusau về mảng bám là đúng TRỪ____
A. Nó bao gồm các vi khuẩn tạo ra axit
B. Không bị ảnh hưởng bởi ăn đồ ngọt
C. Nó có thể được loại bỏ khỏi răng bằng cách đánh răng và dùng chỉ nha khoa
D. Nó làm giảm tác động 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.
Đáp án: B
Đáp án câu 4 là: AGiải chi tiết:
Giải thích:
Chúng ta có thể suy luận từ đoạn văn rằng một lợi ích của fluoride đối với sức khỏe răng miệng là gì?
A. Nó tăng cường men răng
B. Nó kích thích sản xuất nước bọt.
C. Làm cho răng trắng hơn
D. Nó là một chất thay thế cho việc đánh răng và dùng chỉ nha khoa chăm sóc răng.
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. Fluoride toothpaste seems to act in another way, by promoting the remineralization of early carious lesions.
Đáp án: A
Đáp án câu 5 là: BGiải chi tiết:
Giải thích:
Điều gì có thể kết luận từ đoạn văn về đồ ngọt?
A. Tất cả các đồ ngọt nên được tránh.
B. Kẹo phải được ăn một cáchcẩn thận.
C. Tốt hơn là nên ăn kẹo vào 1 khoảng thời gian nhất định trong ngày.
D. Các đồ ngọt có vị ngọt ít gây hại hơn các đồ ngọt khác.
Đáp án: B
Đáp án câu 6 là: BGiải chi tiết:
Giải thích:
Tác giả của đoạn văn nói rằng lượng axit sinh ra từ vi khuẩn trong nước bọt của bạn tăng theo_______
A. lượng kẹo mà bạn ăn
B. số lần bạn ăn kẹo
C. nếu bạn ăn kẹo với bữa ăn chính của bạn
D. nếu ăn kẹo 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.
Đáp án: B
Đáp án câu 7 là: CGiải chi tiết:
Giải thích:
Từ "scrap off" có nghĩa gần với_____
A. cự tuyệt
B. xoay với
C. loại bỏ
D. phân hủy
Scrap off: loại bỏ
=> Scrap off = Remove
Đáp án: C
Luyện tập
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