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  3. The idea that people might be chosen or rejected for jobs on the basis of their genes disturbs many．Such【1】may，however，be a step

The idea that people might be chosen or rejected for jobs on the basis of their genes disturbs many．Such【1】may，however，be a step

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问题   The idea that people might be chosen or rejected for jobs on the basis of their genes disturbs many．Such【1】may，however，be a step【2】 ，thanks to work just published in Current Biology by Derk-JanDijk and his colleagues at the University of Surrey，in England．Dr．Dijk studies the biology of time-keeping—in particular of the part of the internal body-clock that【3】people to sleep and wakes them up．One of the genes involved in【4】this clock is known as PER3 and【5】in two forms．Dr．Dijk’s work【6】that one of these forms is more conducive to night-shift work than the other．
  The two forms of PER3 7 into two slightly different proteins，one of which is longer than the other．8 work by this group showed that people with two short versions of the gene are more likely to be“owls”，【9】to get up late and go to bed late．“Larks”【10】，early risers，have two long versions．Pursuing this 11 of enquiry．Dr．Dijk and his team have been studying how such people【12】to sleep deprivation．Two dozen volunteers．some genetic owls and some genetic larks，were forced to stay awake
  for two days．The genetic larks reacted to this worse than the owls did【13】larks given memory tests and puzzles to【14】between the hours of four and eight in the morning turned【15】far worse performances than did owls．
  What 【16】that may have for employers is not fully clear Nevertheless．it is intriguing．There may【17】come a time when employers【18】night shifts will want a blood sample from【19】employees【20】 to protect themselves against negligence suits should someone have an accident．
【8】
选项 A、Subsequent
B、Latest
C、Present
D、Previous
答案D
解析 考查逻辑关系。空格处表示“该研究小组 ________的研究”。由文章可知，该研究的结果是：拥有两种都可转化为较短蛋白质基因的人更有可能成为“夜猫子”，而“百灵鸟”类型的人则有两种都可转化为较长蛋白质的基因。前文提到的一项研究结果为“其中一种形态比另一种对夜班工作更有益”。由此可以推知，前文的研究是在本处提到的研究的基础上得来的，因此本句的研究应该发生在前。因此正确答案为D项：Previous“先前的，以往的”。Subsequent“随后的”，Latest“最近的，最新的”，Present“现存的，当前的”，均不符合文意。
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