单项选择题

案例分析题 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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单项选择题
Which of the following planets is NOT mentioned
A．Venus
B．Jupiter
C．Earth
D．Mars
单项选择题
Why does the author say that nothing was wasted before the invention of fridges
A．People would not buy more food than was necessary.
B．Food was delivered to people two or three times a week.
C．Food was sold fresh and did not get rotten easily.
D．People had effective ways to preserve their foo
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