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

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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

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陕西中医药大学-中医内科学