单项选择题


A．fellows
B．shift
C．workers
D．colleagues
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单项选择题
It seems that Mars ______.
A．may be inhabited by attractive Martians
B．may have some vegetable life
C．can have no life at all
D．may have both vegetable and animal life
单项选择题
Gauss wanted to establish contact with the Martians by ______.
A．planting trees in triangular shape
B．filling wide ditches with oil
C．building a large mirror
D．making patterns with trees
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