The _______look on his face shows that h

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问题选择题

The _______look on his face shows that he’s greatly ___________.

A．terrified; terrified

B．terrified; terrifying

C．terrifying; terrifying

D．terrifying; terrified

答案

答案：D

选择题

—please pass the key _______ the lock.

—oh! Is it a set _______ keys?[ ]

A. Of; of

B. to; of

C. for; to

D. to, for

多项选择题

电子捕获检测器(ECD)主要用于测定的化合物结构特点有

A．含卤素化合物

B．含硫、氧化合物

C．含氰基化合物

D．含羰基化合物

E．含羧基化合物