单项选择题

When the tank can carrying poisonous gas ran off the rails the firemen tried to______ the village from all traffic.

A．dismiss
B．insulate
C．isolate
D．expel
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单项选择题
The body apparently resents being dosed with unusual amounts of a vitamin or mineral and its first______ is to excrete them.
A．reaction
B．impulse
C．response
D．instinct
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
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