单项选择题

A．The air pollution is caused by the development of industry.
B．The city was poor because there wasn’’t much industry then.
C．The woman’’s exaggerating the seriousness of the pollution.
D．He might move to another city very soon.
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单项选择题
A．By theme or period.B．By style or design.C．By manufacturer or origin.D．By function or purpose.
A．By theme or period.
B．By style or design.
C．By manufacturer or origin.
D．By function or purpose.
单项选择题
A．Employ them as lab assistants.B．Teach chemistry classes at their high school.C．Help them with their studies.D．Pay them for participating in the study.
A．Employ them as lab assistants.
B．Teach chemistry classes at their high school.
C．Help them with their studies.
D．Pay them for participating in the study.
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