单项选择题

A．A chemistry assignment.
B．A study that their chemistry professor did.
C．A class that the woman is taking.
D．A job possibility.
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单项选择题
A．Tom will certainly come to repair the stereo.B．Tom cannot repair the stereo.C．Tom doesn’’t keep his word.D．Tom is very trustworthy.
A．Tom will certainly come to repair the stereo.
B．Tom cannot repair the stereo.
C．Tom doesn’’t keep his word.
D．Tom is very trustworthy.
单项选择题
Main types of pollution include smog, acid rain, the greenhouse effect, and holes in the ozone layer.
A．Y
B．N
C．NG
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