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Teeth have a big job. They help us chew food. They help us talk. Some teeth are round(圆的). Some are sharp(尖的). We use round back teeth to grind(磨碎) food. This makes the food easy to swallow(吞咽). We use sharp front teeth to bite into food. Brushing keeps teeth clean. We should brush teeth in the morning and before bedtime. We should change our toothbrushes every three months. Visit the dentist twice(两次) a year. Dentists clean our teeth. They check for cavities. A cavity is a part of a tooth that is not healthy(健康的). A dentist can fix that. Kids have 20 teeth. They fall out. New ones grow in. Adults have 28-32 teeth. It is very important to take good care of our teeth.
52. Teeth can’t help us
. ( )
A. talkB. cook foodC. chew food
53. We use round back teeth to grind food because this makes the food
. ( )
A. nice to eatB. difficult to eatC. easy to swallow
54. The word “cavity” means
in Chinese. ( )
A. 病痛B. 牙龈C. (牙齿的)龋洞
A. 32; 20B. 20; 28-32C. 28; 30
56. Which of the following is RIGHT? ( )
A. Kid’s teeth can work for twenty years.
B. Everyone should take good care of his teeth.
C. We should change our toothbrushes twice a year.
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