单项选择题

All metals are found not to conduct electricity equally well.

A) 人们发现，并不是所有金属的导电性能都一样好。
B) 人们发现所有金属不能同等用来导电。
C) 所有金属被发现不能同样好地发电。
D) 人们发现的所有金属并不都是为了很好地发电。
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