单项选择题

The food industry in our country is developing ______.

A．quickly
B．fast
C．swiftly
D．rapidly
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单项选择题
The sudden change of weather made the temperature ______ a lot.
A．fall
B．sink
C．drop
D．lower
单项选择题
Plastics is a kind of ______ which is widely used in industry.
A．mass
B．substance
C．matter
D．material
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