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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.
【C16】
选项 A、preferences
B、inferences
C、requirements
D、implications
答案D
解析 考查上下文语义及名词辨析。空格处所在处为what引导的名词性从句，正常语序为：that may have what ______ for employers，implication意为“可能的影响、结果或作用”，可以与介词for搭配，代入文中，表示“这个研究会对雇主有何意义尚不完全清楚”，符合文意。preference意为“偏爱，偏好”；inference意为“推断，结论”；requirement“要求，必要条件”，均不符合文意，因此正确答案为D．implications。
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