2014考研英語:閱讀理解基礎(chǔ)階段練習題(四)_跨考網(wǎng)

最后更新時間:2013-03-18 19:00:10
輔導課程:暑期集訓 在線咨詢
復習緊張,焦頭爛額?逆風輕襲,來跨考秋季集訓營,幫你尋方法,定方案! 了解一下>>

  2014考研英語:閱讀理解基礎(chǔ)階段練習題(四)

  Text 4

  Although the use of cloning to produce copies of humans has been suggested, many people would judge this to be morally wrong. In addition, the prospect of cloning humans raises false expectations, since human personality is only partly determined by genes. Cloning a sick or dying relative would provide a genetically identical copy of that person, but this new individual would likely develop a quite different personality. Similarly, a copy of an athlete, movie star, or scientist might well choose another career because of chance events during his or her lifetime. One hypothetical scenario involves a childless couple who wish to make a copy of one or the other partner rather than having a child by artificial insemination. The social concern is that the parents would not be able to treat naturally a child who was a copy of one of them.

  The impetus behind the research that led to Dolly was not to find a way to clone humans but rather to develop genetically engineered animals that would serve a variety of purposes. As there are great genetic differences in cattle herds and sheep flocks, breeding copies of selected livestock would increase the efficiency of agricultural productivity and help improve/boost the quality of such commercial products as milk, beef, and wool.

  As in the management of other breeding schemes, it will be important for scientists to maintain the balance between intense selection of livestock and the maintenance of genetic variability. Preservation of frozen cells from a large number of representatives of different breeds would allow nuclei from those donor cells to be used as required. The ethical issues in animal cloning are perhaps less controversial than with humans; nevertheless, some people worry that producing large number of animal clones only increase the likelihood that these animals will be mistreated.

  Genetic modification of livestock will also provide new opportunities in medicine and research. Today many patients in need of transplants die before organs become available from suitable donors. Cloning pigs has been suggested as a means of rapidly achieving xenotransplantation, the use of animal organs to replace organs in human patients. Organs transplanted between species are in danger of being destroyed within minutes by the acute immune response of the body receiving the transplant; however, strategies are being developed to modify pigs genetically so that rejection by the immune system may be effectively prevented. (394 words)

跨考考研課程

班型 定向班型 開班時間 高定班 標準班 課程介紹 咨詢
秋季集訓 沖刺班 9.10-12.20 168000 24800起 小班面授+專業(yè)課1對1+專業(yè)課定向輔導+協(xié)議加強課程(高定班)+專屬規(guī)劃答疑(高定班)+精細化答疑+復試資源(高定班)+復試課包(高定班)+復試指導(高定班)+復試班主任1v1服務(wù)(高定班)+復試面授密訓(高定班)+復試1v1(高定班)
2023集訓暢學 非定向(政英班/數(shù)政英班) 每月20日 22800起(協(xié)議班) 13800起 先行階在線課程+基礎(chǔ)階在線課程+強化階在線課程+真題階在線課程+沖刺階在線課程+專業(yè)課針對性一對一課程+班主任全程督學服務(wù)+全程規(guī)劃體系+全程測試體系+全程精細化答疑+擇校擇專業(yè)能力定位體系+全年關(guān)鍵環(huán)節(jié)指導體系+初試加強課+初試專屬服務(wù)+復試全科標準班服務(wù)

①凡本網(wǎng)注明“稿件來源:跨考網(wǎng)”的所有文字、圖片和音視頻稿件,版權(quán)均屬北京尚學碩博教育咨詢有限公司(含本網(wǎng)和跨考網(wǎng))所有,任何媒體、網(wǎng)站或個人未經(jīng)本網(wǎng)協(xié)議授權(quán)不得轉(zhuǎn)載、鏈接、轉(zhuǎn)帖或以其他任何方式復制、發(fā)表。已經(jīng)本網(wǎng)協(xié)議授權(quán)的媒體、網(wǎng)站,在下載使用時必須注明“稿件來源,跨考網(wǎng)”,違者本網(wǎng)將依法追究法律責任。

②本網(wǎng)未注明“稿件來源:跨考網(wǎng)”的文/圖等稿件均為轉(zhuǎn)載稿,本網(wǎng)轉(zhuǎn)載僅基于傳遞更多信息之目的,并不意味著再通轉(zhuǎn)載稿的觀點或證實其內(nèi)容的真實性。如其他媒體、網(wǎng)站或個人從本網(wǎng)下載使用,必須保留本網(wǎng)注明的“稿件來源”,并自負版權(quán)等法律責任。如擅自篡改為“稿件來源:跨考網(wǎng)”,本網(wǎng)將依法追究法律責任。

③如本網(wǎng)轉(zhuǎn)載稿涉及版權(quán)等問題,請作者見稿后在兩周內(nèi)速來電與跨考網(wǎng)聯(lián)系,電話:400-883-2220