题目内容

A lot of changes have occurred in China in the last 30 years.

A. happened
B. raised
C. appeared
D. disappeared

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This kind of material was occasionally used in making shoes.

A. never
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涎腺的腺泡分为__、和_。

唇裂是_和__联合或部分联合。

The old man died of a deadly disease.

A. risky
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D. worrying