单项选择题

A．The class meets during his working hours.
B．The class is too far away.
C．He has another class at the same time:
D．He’s already familiar with the material.
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单项选择题
A．It is being raised each year.B．It remains constant.C．It will reach sea level in 9,000 years.D．It is being lowered gradually.
A．It is being raised each year.
B．It remains constant.
C．It will reach sea level in 9,000 years.
D．It is being lowered gradually.
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.
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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