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

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

出自：河北民族师范学院-基础英语一

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