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
At one time the Democratic Party was considered to be a party standing () state rights.

A. up for
B. by
C. out
D. back
单项选择题
The continuous unrest was () the nation’s economy.

A. exaggerating
B. aggravating
C. amending
D. fastening
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