2022年专四阅读理解练习题 (20)

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　　A controversy erupted in the scientific community in early 1998 over the use of DNA (deoxyribonucleic acid ) fingerprinting in criminal investigations. DNA fingerprinting was introduced in 1987 as a method to identify individuals based on a pattern seen in their DNA, the molecule of which genes are made. DNA is present in every cell of the body except red blood cells. DNA fingerprinting has been used successfully in various ways, such as to determine paternity where it is not clear who the father of a particular child is. However, it is in the area of criminal investigations that DNA fingerprinting has potentially powerful and controversial uses.

　　DNA fingerprinting and other DNA analysis techniques have revolutionized criminal investigations by giving investigators powerful new tools in the attempt to trove guilt, not just establish innocence. When used in criminal investigations, a DNA fingerprint pattern from a suspect is compared with a DNA fingerprint pattern obtained from such material as hairs or blood found at the scene of a crime. A match between the two DNA samples can be used as evidence to convict a suspect.

　　The controversy in 1998 stemmed form a report published in December 1991 by population geneticists Richard C. Lewontin of Harvard University in Cambridge, Mass., and Daniel L. Hartl called into question the methods to calculate how likely it is that a match between two DNA fingerprints might occur by chance alone. In particular, they argued that the current method cannot properly determine the likelihood that two DNA samples will match because they came from the same individual rather than simply from two different individuals who are members of the same ethnic group. Lewontin and Hartl called for better surveys of DNA patterns methods are adequate.

　　In response to their criticisms, population geneticists Ranajit Chakraborty of the University of Texas in Dallas and Kenneth K.Kidd of Yale University in New Haven, Conn., argued that enough data are already available to show that the methods currently being used are adequate. In January 1998, however, the federal Bureau of Investigation and laboratories that conduct DNA tests announced that they would collect additional DNA samples form various ethnic groups in an attempt to resolve some of these questions. And, in April, a National Academy of Sciences called for strict standards and system of accreditation for DNA testing laboratories.

　　1.Before DNA fingerprinting is used, suspects____.

　　A.would have to leave their fingerprints for further investigations

　　B.would have to submit evidence for their innocence

　　C.could easily escape conviction of guilt

　　D.cold be convicted of guilt as well

　　2.DNA fingerprinting can be unreliable when ____.

　　A.the methods used for blood- cell calculation are not accurate

　　B.two different individuals of the same ethnic group may have the same DNA fingerprinting pattern

　　C.a match is by chance left with fingerprints that happen to belong to two different individuals

　　D.two different individuals leave two DNA samples.

　　3.To geneticists like Lewontin and Hartl, the current method ____.

　　A.is not so convincing as to exclude the likelihood that two DNA samples can never come from two individuals

　　B.is arguable because two individuals of the same ethnic group are likely to have the same DNA pattern.

　　C.Is not based on adequate scientific theory of genetics

　　D.Is theoretically contradictory to what they have been studying

　　4.The attitude of the Federal Bereau of Investigation shows that ____.

　　A.enough data are yet to be collected form various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual members

　　B.enough data of DNA samples should be collected to confirm that only DNA samples form the same person can match

　　C.enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming form the same person

　　D.additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person

　　5.National Academy of Sciences holds the stance that ____.

　　A.DNA testing should be systematized

　　B.Only authorized laboratories can conduct DNA testing

　　C.The academy only is authorized to work out standards for testing

　　D.The academy has the right to accredit laboratories for DNA testing

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　　一、养成二次阅读习惯，培养逻辑推理能力

　　很多书上要求学生学会分析文章的结构，其实就是要求学生提高逻辑推理能力。在平时练习中，学生做完阅读，唯一可做就是对答案，事实上，纠正答案后对文章的再次阅读往往至关重要。第一遍读文章时，我们应当模拟考试的紧张气氛，尽量高质快速。但，对完答案后，我们有充足的时间再次阅读文章。第二次阅读文章我们的目的不在是获取信息，而是把握文章的布局安排，分析作者的意图。我们必须带着思考再次阅读文章，问问自己以下问题：

　　如果自己写同样题目或题材的文章，会采取何种文章布局?如我们自己设想的布局与作者不同，那么具体不同之处在何处?这篇文章与以前读过的同体裁文章相比，有何特点?

　　也许有人会说，这样的训练不就成了精读课了吗?如果时间允许，二次阅读成了精读，又有何不可?讲求速度的范读是应试而用，要想真正培养逻辑推理能力，提高阅读水平，还非精读不可。文章的是永远读不完的，如果想着去读200篇各种模拟阅读题，倒不如踏踏实实读50篇历年真题。另外，地道的文章分析多了，对自己写文章布局谋篇也不无好处。

　　二、自己学写长句，克服长难句障碍

　　几乎每一篇阅读，总有一两句长难句。有许多同学这样分析那样分析，可就分析不出什么名堂。听力好的同学不一定发音好，可发音好的同学一定听力好。同样，能写出长难句的人当然不会怕什么长难句。

　　同学们应当做的是找一本好的语法书，认认真真学习句子结构那部分。英语的句子主干往往并不复杂，只是其粘着修饰成分过多。我们一开始应当学会如何写出简单的基本句型，然后再通过附加各种从句、插入语、非谓语形式，来逐步扩充句子结构。

　　分析长难句与扩充句子正好是反其道而行之，我们必须一步步“砍”去插入语、各种从句、非谓语形式，来获得句子主干。所以只要“欲简之必先扩之”，我们与其寻求各种长难句分析法，不如先学会自己写长句。

　　三、文章归类阅读，考前复习有奇效

　　阅读文章成千上万，如何从有限中把握规律才是关键。阅读文章总是按照每套试题四篇文章分布，于是众多学子也就按部就班。可是如果我们把自己读过的所有文章按照主题分类，比如分为校园类、医学类、家庭类、环境类等等，到了考前，再按类别复习这些文章，我们不仅能系统掌握某一类别文章常用的词汇，也能把握该类文章的结构特点和出题规律。

　　最好的方法是，我们一开始就制定分类标准，每做完一篇文章就在其标题后或首句前注明文章的类别，这样到了考前，归纳起来就容易多了。

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