单项选择题

The ______ to the biggest desert in China comprised two senior experts and seven young scholars.

A．expansion
B．exploitation
C．excursion
D．expedition
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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
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
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