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4.D 【解析】细节理解题。根据第二段“With the DNA still inside the bone, scientists showed that Neanderthals contributed about 3 to 4 percent of the humans’DNA.'All of the Bacho Kiro individuals had recen Neanderthalancestors,as fewasfive to seven generations back in their family trees,’ says geneticist Mateja Hajdinjak.”和最后一段“The Bacho Kiro people represent a newly identified group of ancient Europeans. Theyhave genetic ties to present-day East Asians and Native Americans.”可知,和尼安德特人基因关系较强的有欧洲人、东亚人和美洲人。本题问基因关系最不强的,所以是非洲人。故选 D。

E

【语篇导读】本文是一篇记叙文。作者讲述了自己在攻读博士学位时,尽管经历很多次失败,但仍不气馁。始终都意志坚定地坚持自己成为科学家的梦想。

1.A 【解析】细节理解题。根据第二段“Iended that year with increased confidence.”可知,在第一年年底时,作者感觉有信心。故选 A。

2.D 【解析】细节理解题。根据第二段“I had switched research projects 5 months earlier, after my first adviser left the university, so I wasn’t so confident going into the exam.”可知,她的导师已不再在那里工作了,所以她改变了研究项目了。故选D。

3.C 【解析】细节理解题。根据第五段“Ispeak Spanish at home, but I have difficulty translating even the simplest scientific concepts into Spanish. This hampered my ability to comfortably speak the expected'language of science’.”可知,是因为她的语言技能不足影响了她在第三次考试中的表现。故选 C。

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