单项选择题

It's bad policy for developing countries to sacrifice environmental protection to () economic growth.

A. discourage
B. weaken
C. promote
D. create

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单项选择题
He raised his arms to ()his face from the blow.

A. protest    
B. protect     
C. prevent    
D. keep
单项选择题
On most of the nights. Jane () reading letters from her boyfriend.

A. stayed off
B. stayed on
C. stayed out
D. stayed up
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