2017年考试复习已经开始，为了帮助大家更好地备考考试，yjbys网小编为大家提供了相应的练习题，以下是职称英语考试理工类C完形填空练习题，希望对大家的备考有所帮助。
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 DNA linger (逗留 ) 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 (唾液) , 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 University in 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 phones of 10 volunteers. They used swabs (药签) 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(擦洗).
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 decide a crime-scene investigation.
1. A. numbers
B. music
C. secrets
D. films
2. A. appeals
B. appoints
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. Nevertheless
D. But
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
答案与解析：
1.A。根据我们的常识，人们通常在手机中储存人名和电话号码。所以A是最佳选择。虽然手机中也能储存音乐、秘密信息和影片，相比之下，不如A合理。
2.C。从上下文语境来看，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均不是答案。
3.B。从上下文语境来看，如同指纹，你的DNA是独一无二的，所以此处只能选择unless。其他选择均不符合句意，也违背了我们对DNA的基本认识。
4.D。这里考查的是固定搭配leave behind(留下)。
5.A。从上下文语境来看，研究结果是用来帮助侦探识别罪犯和受害人的，B、C、D都不能表达这一层意思。
6.D。这里考查的是比较结构，句子中的more提供了选择的线索，表明这里是比较，所以选择than。
7.A。从上文语境来看，犯罪嫌疑人的手机沾上了血迹，随后就扔了。这里显然是扔掉了手机cell phone，所以选择device，其他选项均不能指代cell phone。
8.B。这里考查的是句子间的逻辑关系。从上下文语境来看，她思考微量DNA是否会停留在手机上，因此她与同事们一起对10名志愿者的翻盖手机进行了分析研究。四个选项分别代入，只有so表示因果关系最合适，A、C、D表示的都是转折关系。
9.A。从上下文语境来看，这里搜集的traces指的是DNA traces(DNA痕迹)，而DNA traces是肉眼看不到的，所以选择invisible(看不见的)。
10.D。从上下文语境来看，研究者从手机的两部分收集手机上的DNA痕迹：一是手机外壳，二是放在使用者耳朵上的扬声器。四个选项中贴在耳朵上的不可能是card，screen和keys，只能是speaker(喇叭，扬声器)。
11.A。这里考查的是固定短语be made of(由……制成)。a solution made mostly ofalcohol：一种主要由酒精制成的溶液。
12.B。从上下文语境来看，应该选择back：手机拥有者拿回了手机，再使用一个星期。
13.B。从原文的介词to来看，只有be given to(被给予)和belong to(属于)搭配，另外两个选项不搭配to。从上下文语境来看，科学家在每一部手机上发现了手机拥有者的DNA，显然belong to符合语境。
14.B。下文告诉我们手机经过清洗后仍然有微量DNA出现。所以这里要用surprisingly这个副词，表示令人惊讶。
15.D。从上下文的语境来看，手机可以被加入到决定犯罪现场调查的线索的名单上。四个选项中只有list(名单)符合语境，其他三个选项与句子的意思不符。