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题目内容
（河北建筑工程学院-建筑学-大学英语1）
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
A. is a good conductor
B. are good conductors
C. is a good insulator
D. are good insulators
参考答案