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A. Read each question carefully. Write only the letter of the correct answer. 1. Which of the following DOES NOT belong to the group? A. aluminum 8. plastic C. copper Diron 2. Some materials which allow an electric current to flow through them are called of electricity A. insulators B. convectors C. conductors D. radiators 3. Materials that block an electric current from flowing are called A. insulators B, convectors C. conductors D. radiators 4. Why are electric wire usually made up of copper? A. Because copper is a good insulator, B. Because copper is a good conductor. C. Because copper is a poor insulator. D. Because copper is a poor conductor.
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