单项选择题

We are trying to（）the waste discharged by the factory for profit.

A. exploit
B. exhaust
C. expose
D. exhibit

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单项选择题
Hill wished to win, and he prayed constantly—before breakfast, after lunch, and（）

A. at dawn
B. at noon
C. at weekend
D. at bedtime
单项选择题
What is true about the man（）

A. The man has a cough.
B. The man gave up smoking.
C. The man has a lung disease.
D. The man has a heart attack.
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