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  3. 　　Sexual selection, a mechanism of evolution that can drive the appearance of bright feathers and elaborate horns, is often assu

　　Sexual selection, a mechanism of evolution that can drive the appearance of bright feathers and elaborate horns, is often assu

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问题 　　Sexual selection, a mechanism of evolution that can drive the appearance of bright feathers and elaborate horns, is often assumed to operate largely among males.【B1】________a fresh look at the data suggests it is more widespread among females than many researchers【B2】________
　　It was Charles Darwin who【B3】________suggested that males often compete【B4】________other males for females to mate with-which he argued could help explain why, for instance, some male birds have【B5】________bright plumage【B6】________this makes them a more obvious【B7】________for predators.
　　More recently, biologists have begun to realize that sexual selection【B8】________widely among females too, although Tim Janicke at the Centre for Functional and Evolutionary Ecology in France and his colleagues say it is still assumed to be a【B9】________peculiarity.
　　Now, Janicke and his colleagues have【B10】________evidence of female-orientated sexual selection in 72 species across the animal kingdom from scientific literature【B11】________between 2015 and 2020. They say the analysis suggests that【B12】________for mates in females should be considered the【B13】________
　　" We believe that our view of how we see sex differences in【B14】________, and also sexual selection in particular, is still very【B15】________towards males," says Janicke.
　　The analysis shows evidence of female sexual selection in a broad【B16】________of animals.【B17】________, in various species of pike, it is the female that is more colorful, with more【B18】________to attract mates. And in some tropical wading birds, such as jacanas, females fight each other【B19】________the attention of the highest quality male. The researchers invite investigators to spend more time studying such behavior in females.
　　" Sexual selection is a process that may【B20】________any sex," says Ingrid at Uppsala University in Sweden.
【B1】
选项 A、But
B、Therefore
C、Nevertheless
D、However
答案[A]
解析 本题考查连词辨析。四个选项分别为[A]But“但是，然而(口语常用词，语气较强，泛指与前述情况相反)”；[B]Therefore“因此”；[C]Nevertheless“然而，不过，尽管如此(指尽管做出完全让步，也不会发生任何影响)”；[D]However“但是，然而”。根据上文Sexual selection，…，is often assumed to operate largely among males．“人们通常认为性别选择主要在雄性中产生”和空格所在句…a fresh look at the data suggests it is more widespread among females…“一项新的数据研究表明，这种情况在雌性中更为普遍……”可知，此处与前述情况完全相反，故正确答案在选项[A]和选项[D]中，但However作为“然而”位于句首时，其后必须接逗号，故排除选项[D]。故选项[A]正确。
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