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1、课时跟踪练(一) Introduction & Reading Pre- reading.阅读理解 AThere are many ways in which human cloning is expected to benefit humans.Dr Richard Seed, one of the leading supporters of human cloning technology, suggests that it may someday be possible to completely change the aging process because of what we l
2、earn from cloning.Scientists believe that they may be able to treat heart attack victims by cloning their healthy heart cells and injecting them into the areas of the heart that have been damaged. Heart disease is the number one killer in the US and several other industrialised countries.There has b
3、een a breakthrough with human stem cells. Embryonic stem cells can be grown to produce organs to repair or replace damaged ones. Skin for burn victims, brain cells for the brain damaged, hearts, lungs, and kidneys could be produced. By combining this technology with human cloning technology, it may
4、be possible to produce needed organs for suffering people that will be free of rejection by their immune systems. Conditions such as Alzheimers disease, Parkinsons disease, heart failure, and other problems can be cured if human cloning and its technology are not banned.Though current treatments for
5、 infertility (不生育) are getting a fair amount of publicity in the news, they, in terms of percentages, are not very successful. Some data shows that current infertility treatments are less than 10 percent successful. Couples go through physically and emotionally painful procedures for a small chance
6、of having children. Many couples run out of time and money without successfully having children. Human cloning could make it possible for many more infertile couples to have children than ever before possible.1According to Dr Richard Seed, we can use cloning technology to _.Aproduce more animalsBmak
7、e people live happilyCmake people look youngerDcure people of many diseases解析：选C推理判断题。根据第二段中的“to completely change the aging process”可知，Richard Seed认为克隆技术可以彻底改变变老的进程。因此推知，克隆技术可以使人们看上去更年轻。2We can learn from the passage that _.Acloning has already been used to treat heart diseaseBwe can treat a mans h
8、eart disease by cloning heartsCmost people in industrial countries suffer from heart diseaseDmore people die of heart disease than of other diseases in the US解析：选D细节理解题。根据第三段最后一句可知，心脏病是美国和其他工业化国家的头号杀手，因此在美国死于心脏病的人要比死于其他疾病的人多。3What is the main idea of the last paragraph?AWith cloning infertile couple
9、s could have children.BTreatment of infertility is not successful.CInfertile couples suffer a lot physically and mentally.DIt is difficult for couples to have more children now.解析：选A段落大意题。联系全文可知，本文的主题是人类克隆技术。最后一段点明了现在治疗不孕的成功率很低，许多夫妇饱受煎熬，最后说明了利用人类克隆技术可以使不孕的夫妇有自己的孩子，因此A项正确。4What is the authors attitud
10、e towards human cloning?ASupportive.BDoubtful.CCautious. DCurious.解析：选A推理判断题。根据文章第一句，特别是关键词benefit及第二至五段(都是讲人类克隆技术会给人类带来益处)可推知，作者对人类克隆技术持支持的态度。BIm sure many of you have seen Star Wars, Jurassic Park, Multiplicity, or many of the other movies that describe cloning. Most of what you see in these movie
11、s is false. What you dont know is that cloning could be dangerous, to the clone and to our society as a whole. Its immoral to have a human clone.What about identity? Humans are promised the right to their own personalities. What would happen if we ignore those rights by giving them someone elses gen
12、etic identity? True, personality is not fixed in genetic fault of the cloned.Also, there is a large power struggle here. Cloning means a degree of power and control over another persons physical identity and that ignores their rights and their only personalities. The person doing the cloning would h
13、ave more power than any parent would have.Cloning would also deal with killing embryos (胚胎). You might not have known, but Dolly, the sheep that was cloned in 1996, was one of over 200 sheep embryos and hers was the only embryo that survived. The rest died or were thrown away. Imagine if the failure
14、 rate was that high when we started to clone humans. More than 200 embryos, the start of 200 human beings, would die for the sake of just one embryo that would have the same DNA as someone else.Cloning someone, at this present time, would be extremely dangerous to the birth mother and the clone. In
15、studies done on cows, 4 out of 12 birth mothers died. There is a very high failure rate, which is showed in the cloning of Dolly. Even if you had a few good embryos, failures have been noticeable in animal tests.So, should we work ahead in the world of cloning? I say no. The risks are greater than t
16、he benefits. Its dangerous to the clone and to the birth mother. We would be killing human lives in the process. It would also be a violation (侵害) of the clones right to its own genetic identity and personality.5The author thinks human cloning is wrong mainly for _ reasons.A2B3C4 D5解析：选C推理判断题。文章的第二、三、四、五段各介绍一条理由，所以共四条理由。6Accord
