Although field studies have linked inbreeding to declines among song sparrow populations, some researchers argue that, in nature

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问题 Although field studies have linked inbreeding to declines among song sparrow populations, some researchers argue that, in nature, inbreeding proves_________as a factor when compared with crushing blows from weather changes.
A. hazardous
B. momentous
C. trivial
D. significant
E. precarious
F. inconsequential

选项

答案C,F

解析两句话的逻辑连接词为although，引导让步转折，让步的部分与转折的部分取反。让步的部分：实地研究认为歌雀数量的下降与近亲繁殖有联系。转折的部分：一些研究者声称，在自然界，与气候变化带来的致命性的打击(crushing blows)相比，近亲繁殖是一个________的因素。让步的部分说近亲繁殖是歌雀数量下降的原因，转折的部分表达近亲繁殖不是歌雀数量下降的主要原因即可，所以空格选C项trivial，F项inconsequential(微不足道的)，这里单独解释一下blow这个词。该词在口语中作动词的意思我们再熟悉不过，但当它作名词时，一般考查“突然的打击(an unexpected shock or calamity)”这一含义，比如说sharp blow to sth. 表示对一些事情构成了犀利的打击。

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