单项选择题

A．The earth is a planet.
B．Stars in the sky are actually as small as they look.
C．Satellites are all made by men.
D．Men can conquer other planets.
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单项选择题
Which of the following phrases in the fifth paragraph indicates the fridge’’s negative effect on the environment
A．Hum away continuously.
B．Climatically almost unnecessary.
C．Artificially-cooled space.
D．With mild temperatures.
单项选择题
What is meant by computer literate in Paragraph 1
A．Computer should teach people how to read and write.
B．Computer should know how to read and write.
C．People should understand computers.
D．Computer should know what people want and need.
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