2.The underlined word “defective” is closest to the meaning of
.
A.strangelymadeB.normally developed
C.functioning perfectly D.not functioning properly
解析:选D。词义猜测题。defective“有缺陷的,不能完全适应变化的”;strangelymade“制造得很奇怪的”;normally developed“正常发展的”;functioning perfectly“完美运转的”;
not functioning properly“运行不正常的”。故答案为D。
3.It can be inferred from the passage that
.
gkxx.comA.Mitochondria are inside nearly every cell that change food into useable energy
初中学习网B.DNA of Mitochondria can affect a person’s appearance
C.in medical science ethical factors should be taken into consideration
D.the donor woman’s DNA will not be found in the threeperson baby
解析:选C。推理判断题。根据第二段中的“but critics say they will continue to fight against the technique that they say raises too many ethical (伦理的) and safety concerns.”(……但是反对者说他们将继续反对这项技术,为此他们提出了很多伦理和安全方面的担心。)可知,这项技术在伦理和安全方面存在一定的缺陷。故答案为C。
4.Prime Minister David Cameron
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