单项选择题

A．Write their lab reports.
B．Find out Professor Smith’s schedule.
C．Interview some high school students.
D．Finish their chemistry experiment.
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单项选择题
A．The air is polluted.B．The people there are terrible.C．It’s too windy.D．The beaches are dirty.
A．The air is polluted.
B．The people there are terrible.
C．It’s too windy.
D．The beaches are dirty.
单项选择题
A．Employ them as lab assistants.B．Teach 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 classes at their high school.
C．Help them with their studies.
D．Pay them for participating in the study.
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