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第1题

12. Copper as well as most metals _____ of electricity, but wood is a poor one. A. is a good conductor B. are good co
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第2题

11. The traditional approach _____ with complex problems is to break them down into smaller, more easily managed problem
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第3题

10. Building that railway was very difficult and involved _____ ten tunnels. A. dig B. throwing C. to have thrown
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第4题

9. If you go around with _____ shoulders in this heat you will get burned. A. bare B. hollow C. naked D. empty
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