英语周报牛津英语2O19一2022答案

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9.【答案】B【解析】种群中出现不同的变异性状后,具有有利变异的个体生存和留下后代的机会多,久而久之就形成了适应特定环境的新性状,A正确;达尔文的自然选择学说认为,可遗传的变异是生物进化的原材料,但由于受到当时科学发展水平的限制,对于遗传和变异的本质,达尔文还不能做出科学的解释,B错误;随着生物科学的发展,对遗传变异的研究已经从性状水平深入到基因水平;关于自然选择的作用等问题的研究,也已经从以生物个体为单位发展到以种群为基本单位,这样形成了以自然选择学说为核心的现代生物进化理论,C正确;隔离是物种形成的必要条件,物种形成本身意味着生物类型的增加,同时也意味着生物能以新的方式利用和适应环境,D正确。

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