人大附中小升初英語考試真題練習(xí)及答案

時間：2024-08-02 14:58:20 小升初我要投稿

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　　With only about 1， 000 pandasleft in the world， China is desperately trying to clone(克隆)the animal and save the endangered species(物種). That’s amove similar to what a Texas A & M University researchers have beenundertaking for the past five years in a project called “Noah’s Ark”.

　　Noah’s Ark is aimed atcollecting eggs， embryos(胚胎)， semen and DNA ofendangered animals and storing them in liquid nitrogen. If certain speciesshould become extinct， Dr. Duane Kraemer， a professor in Texas A & M’sCollege of Veterinary Medicine， says there would be enough of the basicbuilding blocks to reintroduce the species in the future.

　　It is estimated that asmany as 2， 000 species of mammals， birds reptiles will become extinct in over100 years. The panda， native only to China， is in danger of becoming extinct inthe next 25 years.

　　Thisweek， Chinese scientists said they grew an embryo by introducing cells from adead female panda into the egg cells of a Japanese white rabbit. They are nowtrying to implant the embryo into a host animal.

　　The entire procedurecould take from three to five years to complete.

　　“The nuclear transfer(核子移植)of one species to another is not easy， and the lack of available(capable ofbeing used) panda eggs could be a major problem，” Kraemer believes. “They willprobably have to do several hundred transfers to result in one pregnancy(having a baby). It takes a long time and it’s difficult， but this could begroundbreaking science if it works. They are certainly not putting any livepandas at risk， so it is worth the effort，” adds Kraemer， who is one of theleaders of the Project at Texas A& M， the first-ever attempt at cloning adog.

　　“They are trying to dosomething that’s never been done， and this is very similar to our work inNoah’s Ark. We’re both trying to save animals that face extinction. I certainlyappreciate their effort and there’s a lot we can learn from what they areattempting to do. It’s a research that is very much needed.”

　　1.The aim of “Noah’s Ark” project is to _______.

　　A. make efforts to clonethe endangered pandas

　　B. save endangeredanimals from dying out

　　C. collect DNA ofendangered animals to study

　　D. transfer the nuclearof one animal to another

　　2.According to Professor Kraemer， the major problem in cloning pandas would bethe lack of _____.

　　A. available pandaeggs B. host animals

　　C. qualifiedresearchers D. enough money

　　3.The best title for the passage may be _______.

　　A. China’s Success inPandas Cloning

　　B. The First ClonedPanda in the World

　　C. Exploring the Possibilityto Clone Pandas

　　D. China —the NativePlace of Pandas Forever

　　4.From the passage we know that _______.

　　A. Kraemer and his teamhave succeeded in cloning a dog

　　B. scientists try toimplant a panda’s egg into a rabbit

　　C. Kraemer will workwith Chinese scientists in clone researches

　　D. about two thousand ofspecies will probably die out in a century

　　【解析】

　　本文講述中國正在竭力克隆瀕臨絕種的熊貓，這和Texas A & MUniversity 的Noah‘s Ark(諾亞方舟)工程極為相似，都是想拯救瀕臨滅絕的動物。

　　1. B。語義理解題。從第2段內(nèi)容可知，“諾亞方舟”工程的目標是把瀕臨滅絕的動物的蛋(卵)、胚胎、體液和DNA儲存在液體氮中，如果某一種動物瀕臨滅絕時，將來可以重現(xiàn)這一動物。

　　2. A。細節(jié)題。從第6段第1句話The nuclear transfer(核子移植) of one species toanother is not easy， and the lack of available (capable of being used ) pandaeggs could be a major problem 可以做出正確判斷。

　　3. C。主旨題。從文章內(nèi)容來看，無論是中國還是世界克隆熊貓還沒有成功，所以排除A、B項;D項內(nèi)容明顯與文章內(nèi)容不符，故排除。所以“探索克隆熊貓的可能性”應(yīng)該是這篇文章的標題。

　　4. D。判斷題。此題B項的干擾性較強，但由于它沒有說明是Chinesescientists，所以應(yīng)排除。A、C項明顯與原文不符。根據(jù)文章第3段第1句可知答案非D莫屬。

　　Zinc(鋅)is one of about 20 elements necessary for good health. It is present in thebody in a very small amount but makes it possible for important chemicalactions to be carried out in cells. Scientists are just beginning to discoverhow zinc and other elements work.

　　Researchers firststudied zinc as a way to speed recovery. Dr. Waltor Powys formerly with theUnited States Air Force noted that the laboratory animals recovered faster whensome matters were added to their food. One of these matters was zinc. Dr. Powyslater tested the zinc treatment on an American airman recovering from medicaloperations. The airman who received zinc sulphate(硫酸鹽)recovered in half of the usual time. Other doctors studied persons who had anumber of strange disorders. The doctors learned that all of these problemswere caused by lack of zinc in the body. They treated these disorders successfullyby giving the patients zinc sulphate.

　　The amount of zinc inthe body can be found by examining blood and hair. A lack of this importantelement is not uncommon among people in both industrial and developingcountries. Zinc is found in most high protein(蛋白質(zhì)) foods suchas meat， milk， fish and eggs. It is also found in whole grains. But many peopledo not eat enough of these food. Food markets should add these elements so thatmore people could get needed amount of these necessary matters.

　　1.Which of the following statements is true?

　　A. Scientists found howzinc works a long time ago.

　　B. People need a largeamount of zinc to be healthy.

　　C. Zinc allows importantchemical actions to take place in cells.

　　D. Zinc must be used inthe course of medical operation.

　　2.One of the results from the study of zinc is that _______.

　　A. there’s only a littlezinc in the human body

　　B. food rich in proteincontains more zinc

　　C. some physicalproblems are caused by lack of zinc

　　D. any patient whoreceives zinc sulphate gets well immediately

　　3.The best title for the passage may be _______.

　　A. A New Discovery B. Zinc and Health