单项选择题

A mere touch at the wall of the cabin can ______ the astronauts flying about in the space ship.

A．enable
B．send
C．make
D．place
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单项选择题
During volcanic ______, dark clouds of smoke fill the sky, bringing fears to local residents.
A．eruption
B．ejection
C．erosion
D．erection
单项选择题
Improving the English ______ of graduate students is actually a demanding undertaking.
A．sufficiency
B．proficiency
C．deficiency
D．efficiency
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