单项选择题

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

A．fall
B．sink
C．drop
D．lower
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Plastics is a kind of ______ which is widely used in industry.
A．mass
B．substance
C．matter
D．material
单项选择题
They overcame all the difficulties and fulfilled the plan ten days ahead of schedule, ______ was something we had not expected.
A．that
B．this
C．it
D．which
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