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7.C【解析】由串、并联电路的知识可知,若L2灯丝烧断,电路的总阻值变大,电流变小,除X2两端的电压变大外,其他部分电压均变小,C项正确,A、B、D项错误
There is a worldwide debate over human cloning.(要点一:人类克隆是世界争议的话题Some people are in complete agreement with it, while others think it wrong.(高分句型一)〈要点二:有人支持,有人不赞成) Like dolly, it can benefit mankind but still lead tosome worries.(要点三:多莉羊的出现虽然有益于人类但是也引发了许多担忧) Humancloning not only satisfies Faye Wilson who cannot have a baby but also excites SeverinoAntinori who desires to clone a human.〈要点四:人类克隆不但满足了不能要孩子的FayeWilson等人,也激发了渴望兗隆人类的 Severino Antinori等人〉 However, lan wilmutbelieves researchers should focus on creating new tissues and organs to cure serious diseasesinstead of copies of humans.(高分句型二)〈要点五:然而 an Wilmut认为研究人员应该专注新组织和器官的研究上来治愈疾病而不是去克隆人类〉