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问题 填空题

家兔具有门齿和臼齿，没有犬齿．______．

答案

与家兔的草食性相适应，家兔的牙齿分为门齿和臼齿，无犬齿，门齿长在上下颌的中央部分，形状像凿子，适于切断食物；臼齿长在上下颌的两侧，有宽阔的咀嚼面．而犬齿适于撕裂食物，为肉食性动物的所具有的．

故答案为：√

句型转换

按要求完成下列各句。

1. His mother doesn't allow him to get his ears pierced.(改为被动语态)

    He _____to get his ears pierced.

2. He thinks he can pass the exam.(改为否定句)

    He _____think he_____ pass the exam.

3. I don't think sixteen-year-olds should be allowed to drive.(改为反意疑问句)

    I don't think sixteen-year-olds should be allowed to drive, _____ ?

4. Alice is too young to go to school.(改为同义句)

    Alice isn't _____to go to school.

5. Nobody can answer the question.(改为被动语态)

    The question_____ answered by anybody.
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多项选择题

点子排列出现异常现象，下列属于点子排列有缺陷的是（）。

A.多次同侧

B.点子连续上升或下降

C.点子全部落在控制界限内

D.周期性变动

E.点子在中心线一侧多次出现
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