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.
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单项选择题
A．Michael has been diving for nine years.B．Michael dives on holidays with his parents.C．Michael loves diving ever since he first tried it.D．Michael has never taken any diving courses.
A．Michael has been diving for nine years.
B．Michael dives on holidays with his parents.
C．Michael loves diving ever since he first tried it.
D．Michael has never taken any diving courses.
单项选择题
A．Cheese burger.B．Fries.C．Coke.D．Diet Pepsi.
A．Cheese burger.
B．Fries.
C．Coke.
D．Diet Pepsi.
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