A. TO B. IN C. ON D. AT READ THE FOLLOWING PASSAGE AND MARK THE...

Câu 30: A. to B. in C. on D. at

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the

correct answer to the questions from 1 to 7.

It is very important to have healthy teeth. Good teeth help us to chew our food. They also help us to

look nice. How does a tooth go bad? The decay begins in a little crack in the enamel covering of the

tooth. This happens after germs and bits of food have collected there. Then the decay slowly spreads

inside the tooth. Eventually, poison goes into the blood, and we may feel quite ill.

How can we keep our teeth healthy? Firstly, we ought to visit our dentist twice a year. He can fill

the small holes in our teeth before they destroy the teeth. He can examine our teeth to check that they

are growing in the right way. Unfortunately, many people wait until they have toothache before they

see a dentist. Secondly, we should brush our teeth with a toothbrush and fluoride toothpaste at least

twice a day - once after breakfast and once before we go to bed. We can also use wooden toothpicks

to clean between our teeth after a meal. Thirdly, we should eat food that is good for our teeth and our

Trang 2/4 - Mã đề thi 101 - https://thi247.com/

body: milk, cheese, fish, brown bread, potatoes, red rice, raw vegetables and fresh fruit. Chocolates,

sweets, biscuits and cakes are bad, especially when we eat them between meals. They are harmful

because they stick to our teeth and cause decay.