单项选择题

However, at times this balance in nature is（）, resulting in a number of possibly unforeseen effects.

A. troubled
B. disturbed
C. confused
D. puzzled

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单项选择题
The terrorists might have planted a bomb on a plane in Athens, set to（）when it arrived in New York.

A. go off
B. get off
C. come off
D. carry off
单项选择题
Our proposal failed to meet the（）established by the committee, so they gave us no money.

A. measurement
B. warrant
C. partition
D. criterion
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