题目内容

We need to work harder toimproveour _______ edge.

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服用大量维生素C也可能会中毒

A. 对
B. 错

能引起中毒的外来物质称为毒物

A. 对
B. 错

中毒可引起多脏器功能损害。

A. 对
B. 错

Aluminium looks heavy but actually ________ very light.

A. it is
B. they are
C. he is
D. she is

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