单项选择题

When coal, the______ of plants, is burnt, chemical energy is changed into heat energy.

A．remains
B．remainders
C．traces
D．remnants
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单项选择题
The drugs must______ in every way to the standards set up by the government.
A．correspond
B．confine
C．conform
D．comply
单项选择题
We must take part in physical labor in order to ______ ourselves more closely with the working people.
A．identify
B．incorporate
C．combine
D．involve
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