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．To provide an opportunity for creative work.B．To educate and improve the community.C．To provide a stage for ordinary people to perform.D．To earn some extra money.
A．To provide an opportunity for creative work.
B．To educate and improve the community.
C．To provide a stage for ordinary people to perform.
D．To earn some extra money.
单项选择题
AIDS is the leading cause of death among women and babies in IS cities of the USA.
A．Y
B．N
C．NG
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