We are convinced that we are on the ______ of an important discovery.A、threshold

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问题 We are convinced that we are on the ______ of an important discovery.

选项 A、threshold
B、household
C、thread
D、entrance

答案 A

解析 A项“threshold开始，开端”符合题意。其他三项“B项household家庭，一家人；C项thread线，线索，思路；D项entrance入口，入门”都不正确。本题空格处是说开始了一个重要的发现。因此A项为正确答案。

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