共用题干 Cell Phone Lets Your Secret OutYour cell phone holds secrets about you.Besides the names and________(51)that you'ye pro- grammed into it,traces of your DNA linger on the device,according to a new study.DNA is genetic material that_________(52)in every cell.Like your fingerprint, your DNA is unique to you一_______(53)you have an identical twin.Scientists today routinely analyze DNA in blood, saliva,or hair left__________(54)at the scene of a crime.The results often help detectives identify________(55)and their victims.Your cell phone can reveal more about you ________(56)you mightthink.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 involved._________(58)she and colleague Margaret Wallace of the City University of New York analyzed the flip一open phones of 10 volun- teers.They used swabs to collect__________( 59)traces of the users from two parts of the phone:the outside,where the user holds it,and the_________(60),which is placed at the user's ear.The scientists scrubbed the phones using a solution made mostly________(61)alcohol.The aim of washing was to remove all detectable traces of DN A.The owners got their phones__________(62)foranother week.Then the researchers collected the phones and repeated the swabbing of 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 be- longed to other people who had apparently also handled the phone.________(64),DNA showed up even in swabs that were taken immediately after the phones were scrubbed.That suggests that washing won't removeall traces of evidence from a criminal's device.So cell phones can now be added to the.__________(65)of clues that can clinch a crime-scene investigation. _________(51)
A.numbers B.music C.secrets D.films正确答案A
