单项选择题

A．Write their lab report.
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．Londoners and the Thames.B．The Clean Air Act.C．Other measures.D．The Clean Air Act and other measures.
A．Londoners and the Thames.
B．The Clean Air Act.
C．Other measures.
D．The Clean Air Act and other measures.
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