问题
选择题
When products made in factories ，they are thrown away as garbage．
A．come to an end
B．are put to use
C．are used up
D．wear out
答案
答案：D
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When products made in factories ，they are thrown away as garbage．
A．come to an end
B．are put to use
C．are used up
D．wear out
答案：D