题目内容

有限点集没有聚点.

A. 对
B. 错

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只有一个聚点的点集一定是有界点集.

A. 对
B. 错

下列电子传递体中，哪个是非蛋白电子传递体

A. NAD
B. FAD
CoQ
D. CytC

l think it is high time we strict measures to stop pollution.

A. will take
B. take
C. took
D. havetaken

It is requested that every student_________a paper on air pollution.

A. writes
B. wrote
C. writing
D. write