单项选择题

The sudden change of weather made the temperature ______ a lot.

A．throw
B．sink
C．drop
D．lower
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单项选择题
Plastics is a kind of ______ which is widely used in industry.
A．mass
B．substance
C．matter
D．material
单项选择题
According to one belief, if truth is to be known it will make itself apparent, so one ______ wait instead of searching for it.
A．would rather
B．had to
C．cannot but
D．had best
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