单项选择题

案例分析题 What may man find in the future

A．There will be no place the same as our Earth.
B．There will be many places, better than our Earth.
C．There will be some planets which may be suitable for our human being to live.
D．There will be a planet for man to be used as home in the near futur
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单项选择题
Scientists think that in the future space stations can be built for the following purposes EXCEPT ______.
A．carrying passengers to planets
B．acting as stop- over points
C．refueling spacecraft
D．providing supply of air, food and water
单项选择题
Which of the following planets is NOT mentioned
A．Venus
B．Jupiter
C．Earth
D．Mars
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