题目内容

Richard became a doctor at the ____ of 20.

A. year
B. time
C. age

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There is a _____ store near the station.

A. book
B. book's
C. books'

Those boys are _____ .

A. a American
B. an American
C. Americans

Ask the boy not to make any _____. I can't fall sleep.

A. voice
B. sound
C. noise

TRIZ理论即发明问题解决理论。

A. 对
B. 错