B.to introduce major breakthroughs that have been made in science
C.to present some questions we can’t yet answer
D.to explain what were once mysteries to our ancestors
答案 C
解析 主旨大意题。根据全文内容,尤其是第二段第二句“But still,there are always questions we can’t yet answer,and The Guardian has listed some of them.”可知答案为C。
2.Chimpanzees and bananas are mentioned as examples to prove that
.
A.human beings are actually not different from other animals
B.animals have completely different DNA from that of plants
C.both animals and plants share the same amount of DNA
D.DNA alone is not good enough to make humans different
答案 D
解析 推理判断题。对于“What makes us human?”这个问题,文章说仅看你的DNA是无法辨别出你的,接下来以黑猩猩和香蕉为例是为了说明仅凭DNA是不能很好地说明人的独特性的。故选D。
3.The underlined word “identical” is closest in meaning to “
”.
A.mysterious
B.unique
C.advanced
D.same
答案 D
解析 词义猜测题。根据画线词前后内容可知,仅看你的DNA是无法辨别出你的,原因是人的DNA有99%与黑猩猩的相同,有50%和香蕉的相同。由此可知identical与same同义,故选D。
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