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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单项选择题
Both certificates are ______ for three months and the ceremony must take place in the district where notice has been given.
A．valuable
B．effective
C．valid
D．functional
单项选择题
The publishing company offers their staff opportunities for ______ in decision-making.
A．apprehension
B．appreciation
C．presentation
D．participation
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