单项选择题

A．to stop a possible comet-Earth collision
B．to knock a chunk out of the comet and see what lies underneath
C．to test a newly developed missile
D．to destroy the comet
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单项选择题
Humans on Earth today are characterized by ______.
A．their existence as free and separate beings
B．their capability of living under favorable conditions
C．their great power and effectiveness
D．their strong desire for living in a close-knit society
填空题
travellers
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