单项选择题

Astronauts are()all ldnds of tests before they are actually sent up in a spacecraft.

A. inclined to
B. subjected to
C. prone to
D. bound to

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No one would have time to read or listen to an account of everything()going on in the world.

A. it is
B. which is
C. that is
D. what is
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You should have your eyes tested every year in case the()of your spectacles need changing.

A. lenses
B. glasses
C. sights
D. crystals
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