时间:2016-04-07 06:58:32
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CellPhone Lets Your Secrets Out
Your cell phone holds secrets about you.Besides the names and numbers thatyou've programmed into it, ______traces____(51) of your DNA linger (遗留) onthedevice according to a new study
DNA is genetic (遗传的)material _____that_____ (52) appears in every cell. Likeyour fingerprint, yourDNA is _____unique______ (53) to you——unless you have anidentical twin. Scientiststoday analyze DNA in blood, saliva (唾液), orhair left____behind_______ (54) at the scene of a crime. The results oftenhelp detectivesidentify ____criminals______ (55) and their victims. Your cellphone can revealmore 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 droppedthe____device_____ (57). This made herwonder whether traces of DNA lingered oncell phones一evenwhen no blood was___involved_____(58). She and colleagueMargaret Wallace ofthe City University of NewYork analyzed the flip-openphones(翻盖手机)of10 volunteers. They used swabs (药签) 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. Theowners 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'sspeaker on each of the phones. Better samples werecollected from the outside ofeach phone, but those swabs also picked up DNAthat belonged to other people whohad apparently also ____handed______ (64) thephone
Surprisingly, DNA showed up even in swabsthat were taken immediately afterthe phones were scrubbed. That suggests thatwashing won't remove all traces of___evidence________ (65) from a criminal'sdevice. So cell phones can now beadded to the list of clues that can clinch (确定)a crime-scene investigation.
51. A. name B.pictures C. shapes D. traces
答案:d
52. A. that B. while C.as D.what
答案:a
53. A. common B. good C. helpful D. unique
答案:d
54. A. behind B. away C. aside D.over
答案:a
55. A. visitors B. travelers C.scientists D.criminals
答案:d
56. A. until B. before C.unless D. than
答案:d
57. A. paper B. document C. device D.file
答案:c
58. A. checked B. involved C. tested D. gathered
答案:b
59. A. invisible B.emotional C. poisonous D. magical
答案:a
60. A. holds B. watches C. drops D. covers
答案:a
61. A. with B.by C. for D. of
答案:d
62. A. collected B. answered C. returned D. used
答案:c
63. A. moved B.changed C. belonged D.turned
答案:c
64. A bought B. repaired C.seen D. handed
答案:d
65. A. smell B. evidence C.sound D.color
答案:b
A man without knowledge is like a house without a foundation. 人没有知识犹如房子没有地基.