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Cell Phone Lets Your Secrets Out
Your cell phone holds secrets about you.Besides the names and numbers that you've programmed into it, ______traces____(51) of your DNA linger (遺留) on thedevice according to a new study
DNA is genetic (遺傳的)material _____that_____ (52) appears in every cell. Like your fingerprint, yourDNA is _____unique______ (53) to you——unless you have an identical twin. Scientiststoday analyze DNA in blood, saliva (唾液), orhair left ____behind_______ (54) at the scene of a crime. The results oftenhelp detectives identify ____criminals______ (55) and their victims. Your cellphone can reveal more about you ____than_____ (56) you might think.
Meghan J. McFadden, a scientist at McMasterUniversity in Hamilton, Ontario, heard about a crime in which the suspect bledonto a cell phone and later dropped the____device_____ (57). This made herwonder whether traces of DNA lingered on cell phones一evenwhen no blood was___involved_____(58). She and colleague Margaret Wallace ofthe City University of NewYork analyzed the flip-open phones(翻蓋手機(jī))of10 volunteers. They used swabs (藥簽) tocollect _____invisible___ (59) traces of the users from two parts of the phone:the outside, where the user ____holds_____(60) it, and the speaker which isplaced at the user's ear
The scientists cleaned the phones using asolution made mostly__of____(61) alcohol. The aim of washing was to remove alldetectable traces of DNA. The owners got their phones back for another week.Then the researchers ___returned________ (62) the phones and cleaned each phoneonce more.
The scientists discovered DNA that _____belonged______(63) to the phone's speaker on each of the phones. Better samples werecollected from the outside of each phone, but those swabs also picked up DNAthat belonged to other people who had apparently also ____handed______ (64) thephone
Surprisingly, DNA showed up even in swabsthat were taken immediately after the phones were scrubbed. That suggests thatwashing won't remove all traces of ___evidence________ (65) from a criminal'sdevice. So cell phones can now be added to the list of clues that can clinch (確定)a crime-scene investigation.
51.A. name B.pictures C. shapes D. traces
52.A. that B. while C.as D.what
53.A. common B. good C. helpful D. unique
54.A. behind B. away C. aside D.over
55.A. visitors B. travelers C.scientists D.criminals
56.A. until B. before C.unless D. than
57.A. paper B. document C. device D.file
58.A. checked B. involved C. tested D. gathered
59.A. invisible B.emotional C. poisonous D. magical
60.A. holds B. watches C. drops D. covers
61.A. with B.by C. for D. of
62.A. collected B. answered C. returned D. used
63.A. moved B.changed C. belongedD.turned
64.A bought B. repaired C.seen D. handed
65.A. smell B. evidence C.sound D.color
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