单项选择题

Space travel is dangerous and the astronauts in space have to （）many discomforts （不适）in their rockets.

A.disturb
B.tremble
C.endure
D.operate

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单项选择题

Happy families are all （）；every unhappy family is unhappy in its own way.

A.like
B.alike
C.likely
D.likeliest

单项选择题

Programming is not a simple thing；it （）a lot of advanced knowledge of mathematics and computer science.

A.invents
B.involves
C.interprets
D.intends

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