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共用题干 Cell Phone Lets Your Secret OutYou

免费考试题库2019-12-17  2
问题 共用题干Cell Phone Lets Your Secret Out

Your cell phone holds secrets about you.Besides the names and________(51)that you'ye pro-
grammed into it,traces of your DNA linger on the device,according to a new study.
DNA is genetic material that_________(52)in every cell.Like your fingerprint, your DNA is unique
to you一_______(53)you have an identical twin.Scientists today routinely analyze DNA in blood,
saliva,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一open phones of 10 volun-
teers.They used swabs 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 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 be-
longed 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 a crime-scene investigation.
选项 _________(51)A:numbersB:musicC:secretsD:films
答案A
解析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、电影和秘密信息，相比之下，不如A合理。 这个句子的意思是：DNA是一种存在于每一个细胞中的基因物质。appeal呼吁，吸引， 上诉；appoint任命，指定；appear有，出现；apply申请，应用。只有C项符合语境，故选C。 此句的意思是：如同指纹，你的DNA是独一无二的―除非你有一个与你完全相同的孪生兄弟或姐妹。因此，此处必须选择unless，其他选择均不符合语境，也违背了有关DNA的基本常识。 leave behind是固定搭配，意为“留下”。 根据对上下文的理解可推知，研究结果是用来帮助侦探识别罪犯和受害人的。由空后的their victims（他们的受害者）也可知答案。 句子中的more提供了选择的线索，more...than的搭配最能表达该句的意思。 定冠词the说明该选项所指内容在前文中已经提到，即cell phone。除了device（设备，装置），其他选项均不能指代cell phone。 前后两个句子是因果关系，故选B。句子大意为：这使她思考微量DNA是否会停留在 手机上，所以，她与同事一起对10名志愿者的翻盖手机进行了分析研究。A、C、D三项表示的都是转折关系。 句子当中的traces指的是DNA traces，而DNA traces是肉眼看不到的，所以选择invisible。 研究者从手机的两部分收集微量DNA：一是手机外壳，二是喇叭。speaker在此处意为“喇叭”。 be made of是固定搭配，意为“由······制成”。a solution made mostly of alcohol：一种主要由酒精制成的溶液。 根据对上下文的理解，应该选择back。本句意思为：手机拥有者拿回了手机，再使用一个星期。 该句要表达的意思应该是：科学家在每一个手机上发现了属于手机拥有者的DNAQ be-long.to是固定搭配，意思是“属于”。 空后内容告诉我们手机经过擦洗后仍然有微量DNA出现。所以这里要用surprisingly这个副词，表示令人惊讶。 根据对上下文的理解，应该选择list，其他三个选项与句子的意思不符。
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