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．Hurry to the conference.B．Skip the conference.C．Take the subway.D．Take a bus.
A．Hurry to the conference.
B．Skip the conference.
C．Take the subway.
D．Take a bus.
单项选择题
A．An old custom.B．The height of chivalry.C．Medieval food.D．The way knights courted ladies.
A．An old custom.
B．The height of chivalry.
C．Medieval food.
D．The way knights courted ladies.
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