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
These charming girls are the ______ of equal pay for men and women.
A．advocates
B．adventurer
C．successors
D．predecessors
单项选择题
The economic recession has meant that job ______ is a rare thing.
A．security
B．safety
C．protection
D．secureness
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