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
Nitrogen is one of noxious gases.
A．Y
B．N
C．NG
单项选择题
A．Janet.B．Chris.C．Her husband.D．The man who called her in the evening.
A．Janet.
B．Chris.
C．Her husband.
D．The man who called her in the evening.
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