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
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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
单项选择题
They cancelled the meeting because most of the representatives ______ it.
A．objected to hold
B．objected holding
C．objected to holding
D．were objected to holding
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