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第1题

13. Air cannot be an element _____ an element cannot be separated. A. in that B. except that C. but that D. now that
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第2题

用于辅助诊断风湿热的抗O试验是( )。 A.溶血反应 B.凝集反应 C.补体结合反应 D.抗毒素对毒素的中和反应 E.沉淀反应
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第3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4题

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