单项选择题

Recent studies have identified four major global environmental risks; acid rain, ozone depletion, deforestation and the greenhouse effect（）

A. recognized
B. proved
C. got rid of
D. multiplied

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单项选择题
The search for the lost ship must be （）because of poor weather.

A. released
B. resigned
C. abandoned
D. surrendered
单项选择题
The game had to be ______ because of crowd trouble.
A. vanished
B. abandoned
C. scattered
D. rejected
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