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
_______conscious of my moral obligations as a citizen.
A．I was and always will be
B．I have to be and always will be
C．I had been and always will be
D．I have been and always will be
单项选择题
Our company decided to______ the contract because a number of the conditions in it had not been met.
A．destroy
B．resist
C．assume
D．cancel
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