单项选择题

These young people have much to be dissatisfied with, and they sometimes do______, but on the whole they study hard, knowing the problems the states is facing.

A．grumble
B．frustrate
C．frown
D．perplex
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单项选择题
In the wine shops, the wine jars were in place, and on one counter could be seen a stain ______a customer had thrown down his glass and fled.
A．where
B．that
C．which
D．how
单项选择题
Researchers______ that genes may determine the strength of the immune system which could help explain how an infectious disease could have a hereditary link.
A．speculate
B．estimate
C．evaluate
D．anticipate
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