单项选择题

A) single C) double B) other D) such

A．single
B．other
C．double
D．such
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单项选择题
A) lacks C) reads B) desires D) uses
A．lacks
B．desires
C．reads
D．uses
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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