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2017年理工类C每日一讲(3.16日)

   2017-03-14   【

  每日一讲

  Cell Phone Lets Your Secrets Out

  Your cell phone holds secrets about you. Besides the names and numbers that you've programmed into it, _____(51)of your DNA linger(遗留)on the device according to a new study

  DNA is genetic(遗传的)material_____(52)appears in every cell. Like your fingerprint, your DNA is_____(53)to you-unless you have an identical twin. Scientists today analyze DNA in blood, saliva(唾液), or hair left_____(54)at the scene of a crime. The results often help detectives identify_____(55)and their victims. Your cellphone can reveal more about you_____(56)you might think.

  Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the_____(57). This made her wonder whether traces of DNA lingered on cell phones-even when no blood was_____(58). She and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones(翻盖手机)of10 volunteers. They used swabs(药签)to collect_____(59)traces of the users from two parts of the phone; the outside, where the user_____(60)it, and the speaker which is placed at the user's ear.

  The scientists cleaned the phones using a solution made mostly_____(61)alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones back for another week. Then the researchers_____(62)the phones and cleaned each phone once more.

  The scientists discovered DNA that_____(63)to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also _____(64)the phone

  Surprisingly, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of_____(65)from a criminal's device. So cell phones can now be added to the list of clues that can clinch(确定)a crime-scene investigation.

  (单项选择题)_____

  A.holds

  B.watches

  C.drops

  D.covers

  【答案】A

  【考点】2016

纠错评论责编:Aimee
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