单项选择题

A．$295,000.
B．$59,746.
C．$50,171.
D．$29,490.
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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.
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.
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.
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