选课中心
7099人选课
GMAT公开讲座
0元
GRE公开讲座
0元
一对一体验课
99元
GMAT模考网站
10000人
GRE模考网站
GMAT课程
GRE课程
托福辅导课程
【定制】1v1
私人订制
资料下载
考前冲刺
扫码添加助教
免费领取
备考资料大礼包
扫码关注公众号
新东方在线GMAT频道为大家带来GMAT阅读新题:Passage 99练习题一文,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道!>>点击查看更多GMAT阅读
Passage 99
Methods for typing blood were developed around the turn of the century, about the same time that fingerprints were first used for identification. Only in the last decade or two, however, have scientists begun to believe that genetic markers in blood and other bodily fluids may someday prove as useful in crime detection as fingerprints.
The standard ABO blood typing has long been used as a form of negative identification. Added sophistication came with the discovery of additional subgroups of genetic markers in blood and with the discovery that genetic markers are present not only in blood but also in other bodily fluids, such as perspiration and saliva.
These discoveries were of little use in crime detection, however, because of the circumstances in which police scientists must work. Rather than a plentiful sample of blood freshly drawn from a patient, the crime laboratory is likely to receive only a tiny fleck of dried blood of unknown age from an unknown “donor” on a shirt or a scrap of rag that has spent hours or days exposed to air, high temperature, and other contaminants.
British scientists found a method for identifying genetic markers more precisely in small samples. In this process, called electrophoresis, a sample is placed on a tray containing a gel through which an electrical current is then passed. A trained analyst reads the resulting patterns in the gel to determine the presence of various chemical markers.
Electrophoresis made it possible to identify several thousand subgroups of blood types rather than the twelve known before. However, the equipment and special training required were expensive. In addition, the process could lead to the destruction of evidence. For example, repeated tests of a blood-flecked shirt—one for each marker—led to increasing deterioration of the evidence and the cost of a week or more of laboratory time.
It remained for another British researcher, Brian Wrexall, to demonstrate that simultaneous analyses, using an inexpensive electrophoresis apparatus (electrophoresis apparatus: 电泳器), could test for ten different genetic markers within a 24-hour period. This development made the study of blood and other fluid samples an even more valuable tool for crime detection.
1. The author of the passage is primarily concerned with describing
(A) how advances in crime detection methods have led to new discoveries in science
(B) various ways in which crime detection laboratories assist the police
(C) the development of new scientific tools for use in crime detection
(D) areas of current research in the science of crime detection(C)
(E) developments in genetic research and their application to crime detection
2. It can be inferred from the passage that electrophoresis resembles fingerprinting in that both
(A) provide a form of negative identification in crime detection
(B) were first developed by British scientists
(C) may be used to help identify those who were present at the time of a crime
(D) were developed by scientists at around the same time(C)
(E) must be employed almost immediately after a crime to be effective
3. The author sets off the word “‘donor’” (line 18) with quotation marks in order to
(A) emphasize that most of the blood samples received by crime laboratories come from anonymous sources
(B) underscore the contrast between the work done in a crime laboratory and that done in a blood bank
(C) call attention to the fact that, because of underfunding, crime laboratories are forced to rely on charitable contributions
(D) show that the word is being used in a technical, rather than a general, sense(E)
(E) indicate that the blood samples received by crime laboratories are not given freely
4. The passage contains information that would answer which of the following questions?
(A) Is evidence of genetic markers in bodily fluids admissible in court?
(B) Can electrophoresis be used to identify genetic markers in saliva?
(C) How many subgroups of blood types are currently identifiable?
(D) How accurate is the process of electrophoresis?(B)
(E) How many tests for genetic markers must police scientists run in order to establish the identity of a criminal?
5. According to the passage, all of the following may reduce the usefulness of a fluid sample for crime detection EXCEPT
(A) the passage of time
(B) discoloration or staining
(C) exposure to heat
(D) the small size of the sample(B)
(E) exposure to contaminants
6. The passage implies that electrophoresis may help scientists determine
(A) whether or not a sample of blood could have come from a particular person
(B) the age and condition of a dried specimen of blood or other bodily fluid
(C) when and where a crime was probably committed
(D) the cause of death in homicide cases(A)
(E) the age, gender, and ethnic background of an unknown criminal suspect
7. According to the passage, Brian Wrexall’s refinement of electrophoresis led to
(A) more accurate test results
(B) easier availability of fluid samples
(C) wider applicability of genetic analysis
(D) increased costs of testing(E)
(E) more rapid testing
8. Which of the following statements about genetic markers can be inferred from the passage?
I. They carry an electrical charge.
II. They cannot be identified through standard ABO blood typing.
III. They were of no use in crime detection before the invention of electrophoresis.
(A) I only
(B) II only
(C) III only
(D) II and III only(A)
(E) I, II, and III
以上就是新东方在线GMAT频道为你带来的GMAT阅读新题练习题,更多精彩敬请关注新东方在线GMAT频道。
资料下载
新东方GMAT佛脚词汇1.0版本
发布时间:2023-06-30添加新东方美研助教号
回复【资料】获取
新东方GMAT数学500题资料下载
发布时间:2023-05-26添加新东方美研助教号
回复【资料】获取
新东方GMAT800题资料下载
发布时间:2022-05-21添加新东方美研助教号
回复【资料】获取
1000句GMAT真实句子改错问题
发布时间:2022-04-17添加新东方美研助教号
回复【资料】获取
2024杨鹏阅读难句(GMAT+GRE)教程
发布时间:2022-04-17添加新东方美研助教号
回复【资料】获取
新东方GMAT数学500题(解析及答案)
发布时间:2019-11-27添加新东方美研助教号
回复【资料】获取
新东方GMAT800题(逻辑+语法+阅读)
发布时间:2019-11-27添加新东方美研助教号
回复【资料】获取
新东方GMAT佛脚词汇1.0版本
发布时间:2019-11-27添加新东方美研助教号
回复【资料】获取
GMAT词汇/长难句/语法资料大全
发布时间:2019-11-27添加新东方美研助教号
回复【资料】获取
GMAT语文考试圣经(Bible)电子版
发布时间:2019-11-27关注新东方在线美研订阅号
回复【GMAT】获取
GMAT推理圣经PDF电子版
发布时间:2019-11-27添加新东方美研助教号
回复【资料】获取
GMAT考试OG五个版本题号对照表
发布时间:2019-11-27添加新东方美研助教号
回复【资料】获取
GMAT Ultimate Grammar电子书籍PDF
发布时间:2019-11-27添加新东方美研助教号
回复【资料】获取
添加美研助教号,
回复【GMAT】获取备考必看资料包
推荐阅读
更多>>新东方在线GMAT频道为大家带来GMAT阅读复习的五大步骤,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 1:原来
新东方在线GMAT频道为大家带来GMAT阅读背景的培养,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 一、经济学
新东方在线GMAT频道为大家带来GMAT阅读复习效率不高怎么办,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 建
新东方在线GMAT频道为大家带来GMAT阅读提高速度的根本方法,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 1
新东方在线GMAT频道为大家带来GMAT阅读如何避免错误,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 要避免GMA
新东方在线GMAT频道为大家带来GMAT阅读技巧的提升,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! GMAT阅读推
新东方在线GMAT频道为大家带来GMAT阅读备考的注意事项,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! GMAT阅
新东方在线GMAT频道为大家带来GMAT阅读怎么提高自己的能力,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 建
新东方在线GMAT频道为大家带来GMAT阅读长句子的备考,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 1 首先
新东方在线GMAT频道为大家带来GMAT阅读水平怎么提高,希望对大家GMAT备考有所帮助。更多精彩尽请关注新东方在线GMAT频道! 下面就来
资料下载
更多>>添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
关注新东方在线美研订阅号
回复【GMAT】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
添加新东方美研助教号
回复【资料】获取
阅读排行榜
相关内容