Lewis Latimer’s inexpensive method of producing carbon filaments (i)______the na

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问题 Lewis Latimer’s inexpensive method of producing carbon filaments (i)______the nascent electric industry by making electric lamps commercially (ii)______.

选项

答案 B,E

解析 retard减速,transform改变,provoke激起。答案选B。unfledged无经验的,viable可行的,prohibitive禁止的。答案选E。
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