Cell Phone Lets Your Secret Out
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Your cell phone holds secrets about you. Besides the names and 1 that you've programmed into it, traces of your DNA2linger on the device, according to a new study.
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. f! a0 r* s9 a+ k9 F$ jDNA is genetic material that 2 in every cell. Like your fingerprint, your DNA is unique to you 3 you 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 you 6 you might think.4 I! F9 m0 n2 B, ]0 g$ ^
/ O8 m& G m/ ?0 e% T. R* _, X' p! ]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 the 7 This made her wonder whether traces of DNA lingered on cell phones--even when no blood was involved. 8 she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones3 of 10 volunteers. They used swabs to collect 9 traces of the users from two parts of the phone: the outside, where the user holds it, and the 10 , which is placed at the user's ear.- M/ x2 R/ q8 N' r2 [$ R
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The scientists scrubbed the phones using a solution made mostly 11 alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones 12 for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more., p, Q4 T2 O! N+ L7 S6 L
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The scientists discovered DNA that 13 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 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 the 15 of clues that can clinch a crime-scene investigation.
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词汇:
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linger v.逗留 flip-open phone 翻盖手机5 o1 Q( o) K: J; k3 i: c, ?2 B
( H! z6 i2 d% L1 I; e& O6 ygenetic adj.遗传的 swab n. 药签6 h. P$ b. S. e& t' ]% _
* {5 L7 H$ s6 V0 ?) Fsaliva n. 涎，唾液 scrub v. 用力擦洗;擦净$ R4 G: ~) K# c! }
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bleed v. 流血 clinch v.确定，决定
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注释:
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" M" S m2 r1 @ D9 l y% G) N1.McMaster University：麦克马斯特大学，位于加拿大安大略省汉密尔顿市，成立于1887年。/ z4 ]2 f' p& C7 g* l+ }) p" Y
$ V8 b6 W2 J: g+ m2.DNA：脱氧核糖核酸。系deoxyribonucleic acid的缩写。 .
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3.flip—open phones：翻盖手机。又可作flip phones。' a9 X1 j$ {- X! r' E. m. S
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练习：
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" q( w( u2 T8 k1. A numbers B music C secrets D films( B: R/ D% j; d( Z: a. G* g# _
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2. A appeals B appoint C appears D applies% K0 X/ \4 Y2 c2 u, P5 G
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3. A because B unless C although D still
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4. A about B in C for D behind- M5 I; L7 }" g! U
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5. A criminals B people C men D policemen
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7 @% C6 }( G4 j4 d6. A when B until C before D than
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7. A device B paper C file D document
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8. A However B So C But D Nevertheless
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9. A invisible B non-existent C visible D apparent
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7 z; f% z8 n: P# |7 @& i( b10. A card B keys C screen D speaker: f( K, s4 E% z8 Z% R& U3 p
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11. A of B up C on D into
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& l, g$ y# a7 g% B: w- }9 o2 k12. A upon B back C without D with
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+ @7 ^" h3 ?8 T( X, ~: i: m5 K13. A was given B belonged C was owned D became: z6 n: w; C' i# [4 i% P q
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14. A Generally B Surprisingly C Disappointedly D Shortly+ h7 V2 e- t3 F3 E
% ]" s4 t7 l3 x/ F& U15. A explanation B discovery C book D list) `* h; }2 a8 q, i8 v) R( }0 k( Z
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答案与解析：) C8 r# b( }" l5 _+ ~0 k3 e
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1.A人们通常在手机中储存人名和他们的电话号码。所以A是最佳选择。虽然手机中也能储存音乐和秘密信息，相比之下，不如A合理。至于储存电影片子，就有点离谱了。9 o! D+ Q2 N" ?! A# r4 T
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2.C这个句子的意思是：DNA是一种存在于每一细胞中的基因物质。根据这一理解，选项A、B、D均不能选作答案。
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/ b( V2 G* ?" _& u0 A& n3.B上文的意思是：如同指纹，你的DNA是独一无二的。因此，此处必须选择unless，其他选择均不符合句义，也违背了我们对DNA的基本常识。 4.D leave behind是固定搭配，意即：留下。此处leave使用的是过去分词形式。8 q* D4 e1 [" s+ {1 J4 t
1 C Q: l+ i0 R& m8 b" Y' I5.A根据上下文的理解，研究结果是用来帮助侦探识别罪犯和受害人的，8、c、D都不能表达这一层意思。! n" o+ I* @2 y
. V, O* }2 j4 O! y6.D句子中的more提供了选择的线索，more…than的搭配最能完成该句的意思。 X h$ G3 c0 @6 N4 d
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7.A定冠词the说明该选项所指内容在前面已经提到，即cell phone。除了device，其他选项均不能指代cell phone。, B# ?8 y) W3 {1 z
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8.B 四个选项中只有B是正确选择。s0连接了其前后两个句子，使其形成因果关系：她思考微量DNA是否会停留在手机上，所以，她与同事们一起对10名志愿者的翻盖手机进行了分析研究。A、C、D表示的都是转折的意义关系。: P& W) E( Q3 D) g7 w7 {& z
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9.A句子当中的paces指的是DNA traces(微量DNA)，而DNA paces是肉眼看不到的，所以选择invisible。 |
发表于 2012-8-16 00:07:50
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