2. 外语
  3. Studies of (i)______of turtles are sometimes (ii) ______by the fact that the subjects live so long that researchers retire befor

Studies of (i)______of turtles are sometimes (ii) ______by the fact that the subjects live so long that researchers retire befor

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问题 Studies of (i)______of turtles are sometimes (ii) ______by the fact that the subjects live so long that researchers retire before the studies can be completed.
选项
答案A，F
解析 by the fact that表示同义重复，后文是对前文的解释。第一空与live so long(活得非常长)对应，因此应该填入一个表示“长寿”意味的词。longevity长寿，extinction灭绝，reproduction繁殖。答案选A。后文说研究还没完成，研究人员就退休了。说明长寿成了研究的“阻碍”。bolster支撑，belie与……相时立，hamper阻碍。答案选F。
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