2. 外语
  3. Scientific discoveries are often thought of as the result of (i)______effort, but many discoveries have, in fact, arisen from (i

Scientific discoveries are often thought of as the result of (i)______effort, but many discoveries have, in fact, arisen from (i

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问题 Scientific discoveries are often thought of as the result of (i)______effort, but many discoveries have, in fact, arisen from (ii)______or a mistake.
选项
答案B，D
解析 but说明前后反义重复；or说明前后同义重复。第二空与mistake(错误)同义重复。accident意外，method方法，mishap不幸。答案选D。第一空与第二空反义重复。incidental意外的，systematic系统的，collaborative协作的。答案选B。
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