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单项选择题
A．Not all Americans can afford traveling in space.B．Not all Americans think it a good idea to go into space.C．Most Americans regard space tourism ridiculous.D．Rich Americans are willing to pay a lot to fly into space.
A．Not all Americans can afford traveling in space.
B．Not all Americans think it a good idea to go into space.
C．Most Americans regard space tourism ridiculous.
D．Rich Americans are willing to pay a lot to fly into space.
单项选择题
A．They work with precision.B．They do physical exercises for us.C．They work round the clock.D．They free us from tedious and boring work
A．They work with precision.
B．They do physical exercises for us.
C．They work round the clock.
D．They free us from tedious and boring work
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