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
The heating system, which adopts the newest technique, has an ______ temperature control.
A．automobile
B．auxiliary
C．available
D．automatic
单项选择题
It took us five hours to get down from the mountain. After having a rest we to the nearest village.
A．proceeded
B．advanced
C．progressed
D．plunged
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