六級英語閱讀理解練習題及答案

　　閱讀理解是六級考試中的必考題型，在剩下的備考時間裡必須抓緊閱讀練習，下面小編為大家帶來，歡迎考生閱讀練習。

　　六級英語閱讀理解練習題1

　　A controversy erupted in the scientific community in early 1998 over the use of DNA***deoxyribonucleic acid *** fingerprinting in criminal investigations. DNA fingerprinting wasintroduced 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 redblood cells. DNA fingerprinting has been used successfully in various ways, such as todetermine paternity where it is not clear who the father of a particular child is. However, it isin the area of criminal investigations that DNA fingerprinting has potentially powerful andcontroversial uses.

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

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

　　In response to their criticisms, population geneticists Ranajit Chakraborty of theUniversity 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 usedare adequate. In January 1998, however, the federal Bureau of Investigation and laboratoriesthat conduct DNA tests announced that they would collect additional DNA samples formvarious ethnic groups in an attempt to resolve some of these questions. And, in April, aNational Academy of Sciences called for strict standards and system of accreditation for DNAtesting laboratories.

　　六級英語閱讀理解練習題

　　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 fingerprintingpattern

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

　　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 nevercome from two individuals

　　B.is arguable because two individuals of the same ethnic group are likely to have the sameDNA 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 unlikelihoodof two DNA samples coming from two individual members

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

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

　　D.additional samples from various ethnic groups should be collected to determine thattwo 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

　　六級英語閱讀理解練習題答案

　　CBABB

　　六級英語閱讀理解練習題2

　　Racket, din clamor, noise, whatever you want to call it, unwanted sound is America’s mostwidespread nuisance. But noise is more than just a nuisance. It constitutes a real and presentdanger to people’s health. Day and night, at home, at work, and at play, noise can produceserious physical and psychological stress. No one is immune to this stress. Though we seemto adjust to noise by ignoring it, the ear, in fact, never closes and the body still responds—sometimes with extreme tension, as to a strange sound in the night.

　　The annoyance we feel when faced with noise is the most common outward symptom ofthe stress building up inside us. Indeed, because irritability is so apparent, legislators havemade public annoyance the basis of many noise abatement programs. The more subtle andmore serious health hazards associated with stress caused by noise traditionally have beengiven much less attention. Nevertheless, when we are annoyed or made irritable by noise, weshould consider these symptoms fair warning that other thing may be happening to us, some ofwhich may be damaging to our health.

　　Of many health hazards to noise, hearing loss is the most clearly observable andmeasurable by health professionals. The other hazards are harder to pin down. For many of us,there may be a risk that exposure to the stress of noise increases susceptibility to diseaseand infection. The more susceptible among us may experience noise as a complicating factorin heart problems and other diseases. Noise that causes annoyance and irritability in healthpersons may have serious consequences for these already ill in mind or body.

　　Noise affects us throughout our lives. For example, there are indications of effects on theunborn child when mothers are exposed to industrial and environmental noise. During infancyand childhood, youngsters exposed to high noise levels may have trouble falling asleep andobtaining necessary amounts of rest.

　　Why, then, is there not greater alarm about these dangers? Perhaps it is because the linkbetween noise and many disabilities or diseases has not yet been conclusively demonstrated.Perhaps it is because we tend to dismiss annoyance as a price to pay for living in the modernworld. It may also be because we still think of hearing loss as only an occupational hazard.

　　六級英語閱讀理解練習題

　　1.In Paragraph 1, the phrase “immune to” are used to mean ___.

　　A.unaffected by

　　B.hurt by

　　C.unlikely to be seen by

　　D.unknown by

　　2.The author’s attitude toward noise would best be described as ___.

　　A.unrealistic

　　B.traditional

　　C.concerned

　　D.hysterical

　　3.Which of the following best states the main idea of the passage?

　　A.Noise is a major problem; most people recognize its importance.

　　B.Although noise can be annoying, it is not a major problem.

　　C.Noise is a major problem and has not yet been recognized as such.

　　D.Noise is a major problem about which nothing can be done.

　　4.The author condemns noise essentially because it ___.

　　A.is against the law

　　B.can make some people irritable

　　C.is a nuisance

　　D.in a ganger to people’s health

　　5.The author would probably consider research about the effects noise has onpeople to be ___.

　　A.unimportant

　　B.impossible.

　　C.a waste of money

　　D.essential

　　六級英語閱讀理解練習題答案

　　ACCDD