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.
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单项选择题
A．Students are not required to attend regular class lectures.B．The professor videotapes class lectures for review.C．Classes are held at various locations throughout the area.D．Students receive credit for work experience.
A．Students are not required to attend regular class lectures.
B．The professor videotapes class lectures for review.
C．Classes are held at various locations throughout the area.
D．Students receive credit for work experience.
单项选择题
About a quarter of the tramps and beggars the author met were _______.
A．cynical parasites
B．once quite good at mining and making cotton
C．like animals in trap
D．young workers bewildered by what had happened to them
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