50 BÀI TẬP ĐỌC HIỂU – PHẦN 6
CHUYÊN ĐỀ: BÀI TẬP ĐỌC HIỂU
MÔN: TIẾNG ANH LUYỆN THI THPT QG
Mục tiêu:
- Vận dụng được những kiến thức từ vựng đã học được trong suốt lớp 10 đến 12 để dịch được câu hỏi, các
đáp án và hiểu được nội dung cơ bản của bài đọc.
- Biết tìm từ khóa trong câu hỏi, các đáp án và trong bài đọc để tìm ra câu trả lời; vận dụng kỹ năng đọc
lướt và đọc lấy thông tin chi tiết.
Exercise 1. 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.
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.
Question 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
Question 2: The word “it” refers to_________.
A. dental floss
B. bacteria
C. removal of plaque
D. plaque
Question 3: 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
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