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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【C1】______may, however,

The idea that people might be chosen or rejected for jobs on the basis of their genes disturbs many. Such【C1】______may, however,

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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【C1】______may, however, be a step【C2】______, thanks to work just published in Current Biology by Derk-Jan Dijk and his colleagues at the University of Surrey, in England. Dr. Dijk studies the biology of timekeeping—in particular of the part of the internal body-clock that【C3】______people to sleep and wakes them up. One of the genes involved in【C4】______this clock is known as PER3 and【C5】______in two forms. Dr. Dijk’s work【C6】______ that one of these forms is more conducive to night-shift work than the other.
    The two forms of PER3【C7】______ into two slightly different proteins, one of which is longer than the other. 【C8】______work by this group showed that people with two short versions of the gene are more likely to be "owls",【C9】______ to get up late and go to bed late. "Larks"—【C10】______, early risers, have two long versions. Pursuing this【C11】______of enquiry, Dr. Dijk and his team have been studying how such people【C12】______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.【C13】______, larks given memory tests and puzzles to【C14】______between the hours of four and eight in the morning turned【C15】______far worse performances than did owls.
    What【C16】______ that may have for employers is not fully clear. Nevertheless, it is intriguing. There may 【C17】______come a time when employers【C18】______night shifts will want a blood sample from【C19】______employees—【C20】______ to protect themselves against negligence suits should someone have an accident.
【C10】
选项 A、to be specific
B、so to speak
C、in other words
D、put simply
答案C
解析 考查逻辑关系。破折号及空格处短语用来说明“百灵鸟”与“早睡早起的人”之间的关系，根据语境可知，此处在对比百灵鸟和夜猫子的生活习惯，因此可以推知，“百灵鸟”就是“早睡早起的人”，因此C．in other words“换句话说”符合文意，为正确答案。to be specific“具体地说”；so to speak“可以这样说”；put simply“简单地说”，均不符合题意。
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