题目内容
Cell Phone Lets Your Secret OutYour cell phone holds secrets about you. Besides the names and (51) that you’ve programmed into it, traces of your DNA linger(逗留) on the device, according to a new study.DNA is genetic(遗传的) material that (52) in every cell. Like your fingerprint, your DNA is unique to you (53) you have an identical twin. Scientists today routinely analyze DNA in blood, saliva(涎，唾液), or hair left (54) at the scene of a crime. The results often help detectives identify (55) and their victims. Your cell phone can reveal more about you (56) you might think.Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the (57) This made her wonder whether traces of DNA lingered on cell phones -- even when no blood was involved. (58) she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones(翻盖手机) of 10 volunteers. They used swabs(药签) to collect (59) traces of the users from two parts of the phone: the outside, where the user holds it, and the (60) , which is placed at the user’s ear.The scientists scrubbed(用力擦洗；擦净) the phones using a solution made mostly (61) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones(62) for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more.The scientists discovered DNA that (63) 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. (64) , 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 (65) of clues that can clinch(确定，决定) a crime-scene investigation. 58（）
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Memory Test 1. "I am going to give you five techniques that will enable you to remember anything you need to know at school,"promised lecturer lan Robinson to a hundred schoolchildren.He slapped his hand down on the table."When I’ve finished in two hours’ time,your work will be far more effective and productive.Anyone not interested,leave now."The entire room sat still. 2. Robinson calls himself the Mind Magician (魔术师).He specializes in doing magic tricks that look totally impossible,and then he reveals that they involve nothing more mysterious than good old-fashioned trickery (骗术)."I have always been interested in tricks involving memory-being able to reel off (一口气说出) the order of cards in a pack,that sort of thing,"he explains. 3. Robinson was already lecturing to schools on his magic techniques when it struck him that students might find memory techniques even more valuable."It wasn’t difficult area to move inot,as the stuff’s all there in books."So he summarized everything to make a two-hour lecture about five techniques. 4. "You want to learn a list of a hundred thingsA thousandNo problem,"says Robinson.The scandal is that every child is not taught the techniques from the beginning of their school life.The schoolchildren who were watching him thought it was brilliant."I wish I’d been told this earlier,"commented Mark,after Robinson had shown them how to construct"mental journeys". 5. Essentially,you visualize (想象) a walk down a street,or a trip round a room,and pick the points where you will put the things you want to remember-the lamppost,the fruit bowl.Then in each location you put a visual representation of your list-phrasal verbs,historical dates,whatever-making them as strange as possible.It is that simple,and it works. 6. The reaction of schools has been uniformly enthusiastic."The pupils benefited enormously from lan’s presentation,"says Dr Johnston,head of the school where Robinson was speaking."ldeally we should run a regular class in memory techniques so pupils can pick it up gradually."A. Good resultsB. An ancient skillC. Gaining attentionD. Memory tricksE. A lecture on memory techniquesF. Ways to improve memory Paragraph 5 ______.
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