单项选择题

案例分析题 Spaceships of the future will be ______.

A．faster and lighter
B．more convenient and comfortable
C．bigger and lighter
D．quicker and larger
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单项选择题
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
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
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