单项选择题

The engine _______ smoke and steam.

A．gives up
B．gives in
C．gives away
D．gives off
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单项选择题
Some researchers feel that certain people have nervous systems particularly _______ to hot, dry winds. They are what we call weather-sensitive people.
A．subjective
B．subordinate
C．liable
D．vulnerable
单项选择题
Da Vinci was so busy with his numerous inventions that he _______ found enough time to complete his paintings.
A．barely
B．fairly
C．rarely
D．handily
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