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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.
【C19】
选项 A、successive
B、prospective
C、conservative
D、tentative
答案B
解析 考查形容词辨析。空格处所在句意为：总有一天，实行夜班制的雇主会想要一份______雇员的血液样本，B．prospective“潜在的，预期的”符合句意。successive意为“相继的，连续的”；conservative意为“保守的，传统的”；tentative“暂行的，试探性的”，均不符合文意。
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