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．It will rise an average of 1 foot.B．It will be worn down an average of 1 foot.C．It will be worn down to sea level.D．It will lose 730 million tons of solid matter.
A．It will rise an average of 1 foot.
B．It will be worn down an average of 1 foot.
C．It will be worn down to sea level.
D．It will lose 730 million tons of solid matter.
单项选择题
A．Because his parent wanted him to.B．Because it was the only place he could get work.C．Because he had a craving for the West.D．Because he wanted to be an artist.
A．Because his parent wanted him to.
B．Because it was the only place he could get work.
C．Because he had a craving for the West.
D．Because he wanted to be an artist.
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