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  3. Charles Goodyear’s discovery of vulcanized rubber began when he inadvertently spilled a mixture of rubber and sulfur on a hot st

Charles Goodyear’s discovery of vulcanized rubber began when he inadvertently spilled a mixture of rubber and sulfur on a hot st

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问题 Charles Goodyear’s discovery of vulcanized rubber began when he inadvertently spilled a mixture of rubber and sulfur on a hot stove.
选项 A、experimentally
B、unceasingly
C、incompetently
D、accidentally
答案D
解析 inadvertently’“出于无心地”与D项的accidentally“偶然地”意义比较接近。Experimentally“试验地”；unceasingly“不停地”；incompetently“不胜任地”。
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