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
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单项选择题
The room was empty, but Tom felt that ______ was watching him.
A．anybody
B．nobody
C．somebody
D．everybody
单项选择题
Why shouldn’’t we use the garden, ______
A．weather permitting
B．weather permitted
C．weather permits
D．weather having been permitted
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