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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.
【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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