单项选择题

The number of old people is to ______ in the new century.

A．swell
B．switch
C．sweep
D．swing
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单项选择题
Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
A．inclined to
B．subjected to
C．prone to
D．bound to
单项选择题
Professor Taylor's talk has indicated that science has a very strong on the everyday life of non-scientists as well as scientists.
A．motivation
B．perspective
C．impression
D．impact
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