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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【B1】______may however,

The idea that people might be chosen or rejected for jobs on the basis of their genes disturbs many. Such【B1】______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【B1】______may however, be a step 【B2】______ , 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 【B3】______people to sleep and wakes them up. One of the genes involved in 【B4】______ this clock is known as PER3 and【B5】______in two forms. Dr. Dijk’s work【B6】______that one of these forms is more conducive to night-shift work than the other.
    The two forms of PER3 【B7】______ into two slightly different proteins, one of which is longer than the other.【B8】______work by this group showed that people with two short versions of the gene are more likely to be "owls", 【B9】______ to get up late and go to bed late. "Larks"—【B10】______, early risers, have two long versions. Pursuing this【B11】______of enquiry, Dr. Dijk and his team have been studying how such people【B12】______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.【B13】______, larks given memory tests and puzzles to【B14】______between the hours of four and eight in the morning turned【B15】______far worse performances than did owls.
    What【B16】______that may have for employers is not fully clear. Nevertheless, it is intriguing. There may【B17】______come a time when employers【B18】______night shifts will want a blood sample from【B19】______employees—【B20】______to protect themselves against negligence suits should someone have an accident.
【B13】
选项 A、In short
B、In particular
C、In any event
D、On the contrary
答案B
解析 考查逻辑关系及介词短语辨析。空格前阐述：在被迫两天不睡的情况下，百灵鸟比夜猫子的反应要糟糕。空格后阐述：在早晨4点至8点间，百灵鸟的表现更差劲。由此推知，此处为递进关系。只有B．In particular“特别，尤其”符合题意。因此正确答案为B。In short“简言之”，表总结；In any event“无论如何”，表让步；On the contrary“相反”，表对比，均不符合题意。
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