题目内容

Don't worry. I won't leave my office ______ you come back. I'll wait for you.

A. [A] until
B. [B] when
C. [C] while

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It's noisy in the room. Will you ______ the radio

A. [A] turn on
B. [B] turn down
C. [C] turn up

The old man turned on the radio ______ listened to it.

A. [A] but
B. [B] and
C. [C] or

—How ______ do you write to your mother —Twice a month.

A. [A] much
B. [B] soon
C. [C] often

下列化合物在水溶液中，碱性最弱的是（）。

A. N(C2H5)3
B. NH(C2H5)2
C. NH3
D. (C2H5)4N+OH-