单项选择题


A．course
B．shift
C．round
D．turn
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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
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
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