12. Copper as well as most metals _____ of electricity, but wood is a poor one. A. is a good conductor B. are good conductors C. is a good insulator D. are good insulators

12. Copper as well as most metals _____ of electricity, but wood is a poor one.
A. is a good conductor
B. are good conductors
C. is a good insulator
D. are good insulators

出自：河北建筑工程学院-建筑工程技术（专科）-大学英语1

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