单项选择题

Employers who establish retirement plans must be ______ about engaging in transactions with their plans.

A．indecisive
B．cautious
C．implicit
D．conscious
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单项选择题
Please ______ receipt of this document by signing and returning the enclosed form.
A．dignify
B．clarify
C．acknowledge
D．illustrate
单项选择题
Older people can quickly become dispirited and depressed by ______ illness.
A．chronic
B．permanent
C．perpetual
D．sustained
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