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
He has an______ understanding of what needs to be done.
A．infectious
B．incredible
C．incompatible
D．inaccessible
单项选择题
Mainstream economists profess much puzzlement over the failure of the rate of productivity growth to______ so far in this decade.
A．accelerate
B．prevail
C．aggregate
D．precede
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