The passage is mainly about ______. [br] The phrase "stumbled upon" (Line 1, Par

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问题 The passage is mainly about ______. [br] The phrase "stumbled upon" (Line 1, Para. 1) is closest in meaning to" ______".

选项 A、discovered after great efforts
B、found out quite by chance
C、amazed and confused by
D、invented in experiments

答案 B

解析词义辨析题。我们在文章的第一段第一句可以找到“stumbled upon"。但是这里并没有说清楚这个词的含义，只能确定Alec Jeffrey发现了这一方法。文章的第三段第一句接着说明了他是如何发现这一点的。由此可见，他们是无意中发现这一点的，所以答案是B。

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Thepassageismainlyabout______.[br]Bysaying"DNAtestingisnotanunfail