单项选择题

It is hard to tell whether we are going to have a boom in the economy or a （）

A. concession
B. recession
C. submission
D. transmission

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单项选择题
Whenever work is being done, energy（）from one form into another.

A. converts
B. converted
C. is converted
D. is being converted
单项选择题
A light sleeper is usually very （）to any sound even as inaudible as the humming of a mosquito.

A. acute
B. keen
C. alert
D. immune
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