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
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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
单项选择题
Many people like the color white as it is a ______ of purity.
A．symbol
B．sign
C．signal
D．symptom
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