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阅读理解,根据短文内容从各题的四个选项中选择一个最佳答案

Why do baby teeth fall out?

  You probably got your first baby tooth when you were around six months old.And all of 20 lf your primary teeth, or baby teeth, were probably in place by the time you reached the age of three.Then a funny thing happened.When you were about six or seven, your primary teeth began to fall out.

  So what's the point of having these little teeth? Well, the main job of baby teeth is to hold a place in your mouth for your permanent teeth(恒牙), or grown-up teeth.If a baby tooth is lost too early, the teeth beside it may move into that space.Then your permanent teeth may come in crooked(歪的)or crowded.

  When a permanent tooth starts to come in, it pushes on the root of the primary tooth above it.Your primary tooth gets loose(松动的), and soon you have a new hole in your smile.In fact, you may be open-mouthed and looking for your latest loose tooth…

(1)

How old were you when you probably got your first baby teeth?

[  ]

A.

Around half a year old

B.

About three year old

C.

Almost six or seven year old

D.

Nearly fifteen year old

(2)

What does the underlined words “baby teeth” in Chinese?

[  ]

A.

恒牙

B.

乳牙

C.

小牙齿

D.

儿童牙齿

(3)

What's thd main job of baby teeth?

[  ]

A.

To hold a place for permanent teeth

B.

To have a new hole in your smile

C.

To help the permanent teeth push them

D.

To make the teeth beside move into their places

(4)

When a permanent tooth starts to come in, what does not happen?

[  ]

A.

It pushes on the root of the primary tooth above it.

B.

The primary tooth gets loose

C.

The baby tooth above it doesn't get loose at all

D.

Soon you have a new hole in your smile

(5)

When you are twenty, which do you have, baby teeth or permanent teeth?

[  ]

A.

Baby teeth

B.

Permanent teeth

C.

Both

D.

Neither

答案:1.A;2.B;3.A;4.C;5.B;
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