单项选择题

They waited in the ______ for the front door to open.

A．porch
B．porch
C．threshold
D．inlet
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单项选择题
Many people nowadays save money to ______ for their old age.
A．cater
B．supply
C．provide
D．equip
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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