单项选择题

The airport had to close owing to being ______ less than 1,000 feet this morning.

A．feasible
B．flexible
C．visible
D．durable
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单项选择题
This machine has a ______ use in the home. Every member of the family can't handle affairs without it.
A．special
B．specific
C．universal
D．intensive
单项选择题
Complaints should be made to a(an) ______ person, who will deal with your problem seriously.
A．troublesome
B．enthusiastic
C．responsible
D．passive
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