单项选择题

A) more C) well B) less D) a lot

A．more
B．less
C．well
D．a lot
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单项选择题
A) this C) they B) thus D) them
A．this
B．thus
C．they
D．them
单项选择题
The author mentions all of the following as causes of erosion EXCEPT ______.
A．wind
B．rain
C．heat
D．cold
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