单项选择题

Only five of the firm's employees are________; all the other 19 were temporary.

A．permanent
B．persistent
C．perspective
D．pessimistic
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单项选择题
We are foolish enough still to________these old-fashioned ideas.
A．cling on
B．cling lo
C．cling in
D．cling at
单项选择题
It was impossible to estimate what types of costly medical advances will be________in coming years.
A．available
B．applicable
C．approachable
D．attainable
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