题目内容

能引起中毒的外来物质称为毒物

A. 对
B. 错

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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

Poor little baby! What __________ crying for?

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

Hello, who ____________ speaking?

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

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