最新公共英语五级阅读题模拟试题

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　　Section Ⅲ Reading Comprehension

　　(50 minutes)

　　Part A：Read the following texts and answer the questions which accompany them by choosing A，B，C or D.Mark your answers on ANSWER SHEET 1.

　　Text 1

　　Gene therapy and gene based drugs are two ways we could benefit from Our growing mastery of genetic science.

　　But there will be others as well.Here is one of the remarkable therapies on the cutting edge of genetic research that could make their way into mainstream medicine in the coming years.

　　While it’S true that just about every cell in the body has the instructions to make a complete human，most of those instructions are inactivated，and with good reason：the last thing you want for your brain cells is to start churning out stomach acid or your nose to turn into a kidney.The only time cells truly have the potential to turn into any an all body parts is very early in a pregnancy.when so-called stem cells haven’t begun to specialize.

　　Yet this untapped potential could be a terrific boon to medicine.Most diseases involve the death of healthy cells-brain cells in Alzheimer’s，cardiac cells in heart disease，pancreatic cells in diabetes，to name a few;if doctors could isolate stem cells，then direct their growth，they might be able to furnish patients with healthy replacement tissue.

　　It was incredibly difficult，but last fall scientists at the University of Wisconsin managed to isolate stem cells and get them to grow into neural，gut，muscle and bone cells.The process still can’t be controlled，and may have unforeseen limitations;but if efforts to understand and master stem cell development prove successful，doctors will have a therapeutic tool of incredible power.

　　The sanle applies to cloning，which is really just the other side of the coin.True cloning，as first shown with the sheep Dolly two years ago，involves taking a developed cel and reactivating the genome within，resetting its developmental instructions to a pristine state.Once that happens，the rejuvenated cell can develop into a full—fiedged animal，genetically identical to its parent.

　　For agriculture.in which purely physical characteristics like milk production in a cow or low fat in a hog have real market value，biological carbon copies could become routine within a few years.This past year scientists have done for mice and cows what Ian Wilmut did for Dolly，and other creatures are bound to join the cloned menagerie in the coming year.

　　Human cloning，on the other hand，may be technically feasible but legally and emotionally more difficult.

　　Still，one day it will happen.The ability to reset body cells to a pristine，undeveloped state could give doctors exact：

　　ly the same advantages they would get from stem cells：the potential to make healthy body tissues of all sorts，and.

　　thus to cure disease.That could prove to be a true“miracle cure”.

　　51.The writer holds that the potential to make healthy body tissues will_____.

　　[A]aggravate moral issues of human cloning

　　[B]bring great benefits to human beings

　　[C]help scientists decode body instructions

　　[D]involve employing surgical instruments

　　52.The word“rejuvenated”(Para.5)most probably means_____.

　　[A]modified

　　[B]recoliccted

　　[C]classified

　　[D]reactivated

　　53.The research at the University of Wisconsin is mentioned to show_____.

　　[A]the isolation of stem cells

　　[B]the effects of gene therapies

　　[C]the advantages of human cloning

　　[D]the limitations of tissue replacepmnts

　　54.Which of the following is true according to the text?

　　[A]The principle of gene therapy is applicable to that of cloning.

　　[B]The isolation of stem ceils is too difficult to be feasible.

　　[C]It is reasonable for all body instructions to be activated.

　　[D]Cloned animals will eventually take control of the world.

　　55.Towards the genetic research，the author’s attitude can best be said to be that of_____.

　　[A] frustration

　　[B]indifference

　　[C]amazement

　　[D]opposition

　　Section Ⅲ Reading Comprehension(共计35分。权重35%)

　　Part A(每小题1分。共计l5分)

　　Text 1

　　短文赏析

　　基因治疗和以基因为基础的药物是我们从遗传科学中获得利益的两种方式。在未来几年内，这些基因疗法会发展成为主流医学。如果医生利用基因知识，分离干细胞，然后培育这些细胞，他们就可能为病人提供健康的移植组织。这种技术同样也有助于克隆技术的发展，以后越来越多的'动植物将会被克隆，甚至人本身。排除道德法律的因素，利用基因克隆培养出来的人的各种健康器官，一些病将会被更好的治疗。

　　答案及解析

　　51.B【解析】文章开宗明义，在第一段讲述到，如果我们掌握了基因科学，将会对人类有极大的好处。此外第三段的第一句“Yet this un?tapped potential could be a terrific boon to medicine”，意为“然而这种没被开发的潜能对医学有极大的好处”，作者在全文的最后一句又呼应了这一观点。故应选B。

　　52.D【解析】此词出处在第五段，“rejuvenated”和前一句的“reactivating”构成一种近义的重复。故应选D。

　　53.A【解析】由第四段“…the University of Wisconsin managed to isolate stem cells…”可知，虽然研究很困难，但这所大学还是在去年秋天设法分裂了干细胞。故应选A。

　　54.A【解析】文章后面指出其实基因治疗的原理和克隆的原理两者完全是可以通用的，具体的解题点在于文章的第五段第一句话“the same applies to cloning”。故应选A。

　　55.C【解析】这是一个关于作者态度的综合分析题。作者尽管提到有

　　困难，但科学家们正在谈论克服困难的办法而且非常努力，并且作者最后说道“That could prove to be a true‘miracle cure”’，当真正使用克隆技术为人类治疗的时候，那将会是真正的“神奇医疗”。故应选C。

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