第六部分 完形填空（共四篇）
第十三篇
Cell Phone Lets Your Secret Out
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.
DNA 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.
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.
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.
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.
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 secrets D films
2. A appeals B appoint C appears D applies
3. A because B unless C although D still
4. A about B in C for D behind
5. A criminals B people C men D policemen
6. A when B until C before D than
7. A device B paper C file D document
8. A However B So C But D Nevertheless
9. A invisible B non-existent C visible D apparent
10. A card B keys C screen D speaker
11. A of B up C on D into
12. A upon B back C without D with
13. A was given B belonged C was owned D became
14. A Generally B Surprisingly C Disappointedly D Shortly
15. A explanation B discovery C book D list
答案與解析：
1．A人們通常在手機(jī)中儲(chǔ)存人名和他們的電話(huà)號(hào)碼。所以A是最佳選擇。雖然手機(jī)中也能儲(chǔ)存音樂(lè)和秘密信息，相比之下，不如A合理。至于儲(chǔ)存電影片子，就有點(diǎn)離譜了。
2．C這個(gè)句子的意思是：DNA是一種存在于每一細(xì)胞中的基因物質(zhì)。根據(jù)這一理解，選項(xiàng)A、B、D均不能選作答案。
3．B上文的意思是：如同指紋，你的DNA是獨(dú)一無(wú)二的。因此，此處必須選擇unless，其他選擇均不符合句義，也違背了我們對(duì)DNA的基本常識(shí)。 4．D leave behind是固定搭配，意即：留下。此處leave使用的是過(guò)去分詞形式。
5．A根據(jù)上下文的理解，研究結(jié)果是用來(lái)幫助偵探識(shí)別罪犯和受害人的，8、c、D都不能表
達(dá)這一層意思。
6．D句子中的more提供了選擇的線(xiàn)索，more…than的搭配最能完成該句的意思。
7．A定冠詞the說(shuō)明該選項(xiàng)所指內(nèi)容在前面已經(jīng)提到，即cell phone。除了device，其他選項(xiàng)均不能指代cell phone。
8．B 四個(gè)選項(xiàng)中只有B是正確選擇。s0連接了其前后兩個(gè)句子，使其形成因果關(guān)系：她思考微量DNA是否會(huì)停留在手機(jī)上，所以，她與同事們一起對(duì)10名志愿者的翻蓋手機(jī)進(jìn)行了分析研究。A、C、D表示的都是轉(zhuǎn)折的意義關(guān)系。
9．A句子當(dāng)中的paces指的是DNA traces(微量DNA)，而DNA paces是肉眼看不到的，所
以選擇invisible。
10．D研究者從手機(jī)的兩部分收集手機(jī)微量DNA：一是手機(jī)外殼，二是喇叭。貼在耳朵上的
不可能是card、screen和keys。
11．A be made of是固定搭配，意即：由…制成。a solution made mostly of alcohol：一種主要由酒精制成的溶液。
12．B根據(jù)上下文的理解，應(yīng)該選擇back：手機(jī)擁有者拿回了手機(jī)，再使用一個(gè)星期。
13．B 該句要表達(dá)的意思應(yīng)該是：科學(xué)家在每一個(gè)手機(jī)上發(fā)現(xiàn)了屬于手機(jī)擁有者的DNA。
belong t0是固定搭配，意思是：屬于。A不符合句義，c和D不符合語(yǔ)法。
14．B最后一段的第一和第二句告訴我們手機(jī)經(jīng)過(guò)清洗后仍然有微量DNA出現(xiàn)。所以這里
要用surprisingly這個(gè)副詞，表示令人驚訝。
15．D根據(jù)上下文的理解，應(yīng)該選擇D，其它三個(gè)選項(xiàng)與句子的意思不符。
