单项选择题

Hill slopes are cleared of forests to make way for crops, but this only ______the crisis.

A．precedes
B．prevails
C．ascends
D．accelerates
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单项选择题
Some crops are relatively high yielders and could be planted in preference to others to ______ the food supply.
A．enhance
B．curb
C．disrupt
D．heighten
单项选择题
The room was empty, but Tom felt that ______ was watching him.
A．anybody
B．nobody
C．somebody
D．everybody
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