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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单项选择题
The opinion of the writer is that ______.
A．there may be other intelligent beings in the universe
B．there are other intelligent beings in the universe
C．people living on the earth are almost certainly the only intelligent beings in the universe
D．people living on the earth are definitely the only intelligent beings in the universe
单项选择题
There is unlikely any life on Venus because ______.
A．the surface is too hot
B．the weather is too cold
C．it is severely short of water
D．it has a very thin atmosphere
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