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.
【B3】

选项 A、essentially
B、eventually
C、formerly
D、originally

答案[D]

解析 本题考查副词辨析。四个选项分别为[A]essentially“本质上,根本上,基本上”;[B]eventually“最后,终于”;[C]formerly“以前,从前”;[D]originally“原来,起初”。由空格所在句内容可知,“查尔斯.达尔文________提出,雄性为了与雌性交配经常与其他雄性竞争”,而后文中More recently,biologists have begun to realize that sexual selection ________ widely among females too,…“最近,生物学家开始意识到性别选择在雌性中也广泛存在,……”前后语义形成对比,说明达尔文提出的内容是最开始提出的。即“原来”提出的。故选项[D]正确。
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