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题目内容
（河北民族师范学院-基础英语一）
Copper as well as most metals _____ of electricity, but wood is a poor one.（单选）—5分
A is a good conductor
B are good conductors
C is a good insulator
D are good insulators
A is a good conductor
B are good conductors
C is a good insulator
D are good insulators
参考答案