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
Though the banks agree to end relations with clients ______ are unclear, they are still not obliged to inform on a client to anyone.
A．identities
B．their identities
C．of identities
D．whose identities
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
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