Cell Phone Lets Your Secret Out

　　Your cell phone holds secrets about you. Besides the names and1that you've programmed into it, traces of your DNA2linger on the device, according to a new study.

　　DNA is genetic material that2in every cell. Like your fingerprint, your DNA is unique to you3you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, or hair left　 4　 at the scene of a crime. The results often help detectives identify　 5　 and their victims. Your cell phone can reveal more about you6you might think.

　　Meghan J. McFadden, a scientist at McMaster University1in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the7　 This made her wonder whether traces of DNA lingered on cell phones--even when no blood was involved.8she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones3 of 10 volunteers. They used swabs to collect9traces of the users from two parts of the phone: the outside, where the user holds it, and the10, which is placed at the user's ear.

　　The scientists scrubbed the phones using a solution made mostly11alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones12for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more.

　　The scientists discovered DNA that13to 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 handled the phone.　 14, 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 evidence from a criminal's device. So cell phones can now be added to the15of clues that can clinch a crime-scene investigation.

　　詞匯:

　　linger v.逗留flip-open phone 翻蓋手機(jī)

　　genetic adj.遺傳的swab n. 藥簽

　　saliva n. 涎，唾液scrub v. 用力擦洗;擦凈

　　bleed v. 流血clinch v.確定，決定

　　注釋:

　　1.McMaster University：麥克馬斯特大學(xué)，位于加拿大安大略省漢密爾頓市，成立于1887年。

　　2.DNA：脫氧核糖核酸。系deoxyribonucleic acid的縮寫(xiě)。　 .

　　3.flip—open phones：翻蓋手機(jī)。又可作flip phones。

　　練習(xí)：

　　1. A numbers　 　B music　C secretsD films

　　2. A appeals B appointC appearsD applies

　　3. A because B unless　C although　D still

　　4. A about　 B in　C forD behind

　　5. A criminals　B people　C men　D policemen

　　6. A whenB untilC beforeD than

　　7. A device B paper　C file　D document

　　8. A HoweverB So　C ButD Nevertheless

　　9. A invisible　 B non-existent C visible　D apparent

　　10. A card　B keysC screenD speaker

　　11. A of B up　C onD into

　　12. A upon　B backC without　D with

　　13. A was given　B belongedC was ownedD became

　　14. A Generally　B Surprisingly C Disappointedly D Shortly

　　15. A explanation　B discoveryC book　D list