单项选择题

Metals ______ as they grow cool.

A．reduce
B．condense
C．contract
D．compress
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单项选择题
She is not as ______ as her classmates.
A．an active student
B．active the student
C．active a student
D．the active student
单项选择题
Nowadays, the news media keep us informed of what ______ in the world.
A．is happening on
B．is getting on
C．is taking on
D．is going on
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