单项选择题

It is absurd that one ______ possess two freezers in the room.

A．should
B．could
C．ought to
D．is to
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单项选择题
The social security system is designed to ______ a basic standard of living for people in financial need.
A．secure
B．keep
C．preserve
D．maintain
单项选择题
The most ______ organisms will be able to survive in the radically changing environment. A. adaptable B. acceptable C, adjustable D. adoptable
A．C, adjustable
B．adoptable
C．acceptable
D．The most ______ organisms will be able to survive in the radically changing environment.
E．adaptable
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