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1、如有侵权，请联系网站删除，仅供学习与交流历年考研英语模拟试题及答案：阅读篇【精品文档】第 4 页历年考研英语模拟试题及答案：阅读篇 Scientists have known since 1952 that DNA is the basic stuff of heredity. Theyve known its chemical structure since 1953. They know that human DNA acts like a biological computer program some 3 billion bits long that spells out the in
2、structions for making proteins， the basic building blocks of life.But everything the genetic engineers have accomplished during the past half-century is just a preamble to the work that Collins and Anderson and legions of colleagues are doing now. Collins leads the Human Genome Project， a 15-year ef
3、fort to draw the first detailed map of every nook and cranny and gene in human DNA. Anderson， who pioneered the first successful human gene-therapy operations， is leading the campaign to put information about DNA to use as quickly as possible in the treatment and prevention of human diseases.What th
4、ey and other researchers are plotting is nothing less than a biomedical revolution. Like Silicon Valley pirates reverse-engineering a computer chip to steal a competitors secrets， genetic engineers are decoding lifes molecular secrets and trying to use that knowledge to reverse the natural course of
5、 disease. DNA in their hands has become both a blueprint and a drug， a pharmacological substance of extraordinary potency that can treat not just symptoms or the diseases that cause them but also the imperfections in DNA that make people susceptible to a disease.And thats just the beginning. For all
6、 the fevered work being done， however， science is still far away from the Brave New World vision of engineering a perfect humanor even a perfect tomato. Much more research is needed before gene therapy becomes commonplace， and many diseases will take decades to conquer， if they can be conquered at a
7、ll.In the short run， the most practical way to use the new technology will be in genetic screening. Doctors will be able to detect all sorts of flaws in DNA long before they can be fixed. In some cases the knowledge may leadto treatments that delay the onset of the disease or soften its effects. Som
8、eone with a genetic predisposition to heart disease， for example， could follow a low-fat diet. And if scientists determine that a vital protein is missing because the gene that was supposed to make it is defective， they might be able to give the patient an artificial version of the protein. But in o
9、ther instances， almost nothing can be done to stop the ravages brought on by genetic mutations. (409 words)1. It can be inferred from the text that Collins and Anderson and legions of colleagues _.A know that human DNA acts like a biological computer programB have found the basic building blocks of
10、lifeC have accomplished some genetic discovery during the past half-centuryD are making a breakthrough in DNA2. Collins and Anderson are cited in the text to indicate all the following EXCEPT that _.A time-consuming effort is needed to accomplish the detailed map of in human DNAB human gene-therapy
11、operations may be applied to the patientsC gene-therapy now is already generally used to the treatment and prevention of human diseasesD information about DNA may be used in the treatment and prevention of human diseases3. The word “pirate” (line 2， paragraph 3) means_.A one who robs at sea or plund
12、ers the land from the seaB one who makes use of or reproduces the work of another without authorizationC to take (something) by piracyD to make use of or reproduce (anothers work) without authorization4. We can draw a conclusion from the text that_.A engineering a perfect human is not feasible for t
13、he time beingB its impossible for scientists to engineer a perfect tomatoC many diseases will never be conquered by human beingsD doctors will be able to cure all sorts of flaws in DNA in thelong run5. The best title for the text may be _.A DNA and HeredityB The Genetic RevolutionC A Biomedical Revo
14、lutionD How to Apply Genetic Technology词汇注释stuff 物质preamble 开端nook and cranny 排列potency 力量susceptible 易受感染的predisposition 易患病的体质难句讲解1. They know that human DNA acts like a biological computer program some 3 billion bits long that spells out the instructions for making proteins， the basic building bl
15、ocks of life.简析 本句话的主干是“They know that”。they 指的是前面句子中提到的scientists;第一个引导的是宾语从句，some 3 billion bits long修饰computer program，第二个that也修饰computer program;the basic building blocks of life是在解释proteins.2. Anderson， who pioneered the first successful human gene-therapy operations， is leading the campaign to
16、 put information about DNA to use as quickly as possible in the treatment and prevention of human diseases.简析 本句话的主干是“Anderson is leading the campaign”。Who引导的非限定性定语从句，修饰Anderson;to put information短语修饰campaign，其中的to use作目的状语。3. DNA in their hands has become both a blueprint and a drug， a pharmacologi
17、cal substance of extraordinary potency that can treat not just symptoms or the diseases that cause them but also the imperfections in DNA that make people susceptible to a disease.简析 本句话的主干是“DNA has become both a blueprint and a drug”。in their hands修饰DNA;a pharmacological substance是在解释前面的drug，其中的第一个
18、that 引导的定语从句修饰pharmacological substance;第二个that引导的定语从句修饰imperfections.4. And if scientists determine that a vital protein is missing because the gene that was supposed to make it is defective， they might be able to give the patient an artificial version of the protein.简析 本句话的主干是“they might be able to give the patient an artificial version of the protein”。If引导的是条件状语从句，其中的第一个that引导的是宾语从句，because引导的时原因状语从句;第二个that引导的定语从句修饰gene.