2014-2015年选修6-Module-5-Cloning语篇提能练习题及答案解析6份5-5.doc

语 篇 提 能.阅读理解Plant cloning has been an agricultural technique used by farmers and gardeners for centuries. Grafting (嫁接) is a common form of plant cloning. Many plants in nature actually clone themselves and reproduce asexually.Cloned plants are much more predictable than normal plants, so their yield (产量) is more reliable. Cloned plants also reproduce faster，limiting the amount of time between planting and harvesting. It is also often cheaper to produce seeds through cloning than through traditional methods. Plants can essentially be optimized so that farmers or individual growers always have the best seeds available. With higher yield at a faster rate, farms can produce more food for more people while decreasing overall costs.Cloning can be used to wipe out diseases that previously killed off entire fields of crops. This would make plants immune to the kinds of diseases that farmers and gardeners around the world fear each year. Crop failures due to disease and virus could become a thing of the past. Also, plants that are near extinction can be brought back to life through cloning.Through cloning scientists can develop super fruits and vegetables of superior(更好的) nutritional quality. This could make for a healthier population overall. This has already been done through selective pollination(授粉), and genetic cloning could take it to the next level.By plant cloning we have a population of identical plants and all these plants equally suffer from the same diseases, but in nature the weak would die and the strong would survive. While there are some dangers to consider with plant cloning, there are plenty of benefits that could prove vital to the propagation (繁衍) of the human species.1The underlined word “optimized” in Paragraph 2 is closest in meaning to “_”AgrownBproducedCperfected Dexamined2According to the text，cloned plants _.Ahave lower yield than normal plantsBneed less care from peopleCprevent various kinds of diseasesDhave a shorter growth cycle3What can we infer from the text?AThe fruits produced by cloned plants taste much better.BThere are more cloned plants than normal plants now.CPlant cloning can disturb the laws of nature.DPeople should avoid eating cloned fruits.4What is the main purpose of the text?ATo warn the negative effects of plant cloning.BTo show different kinds of plant cloning.CTo predict the future of plant cloning.DTo introduce the advantages of plant cloning.答案与解析：本文主要介绍了植物克隆的好处。1解析：根据so that farmers or individual growers always have the best seeds available可知，optimize与perfect的意思相近。答案：C2解析：从第二段中的Cloned plants also reproduce faster, limiting the amount of time between planting and harvesting可知，克隆的植物的生长周期短。答案：D3解析：从最后一段中的By plant cloning we have a population of identical plants and all these plants equally suffer from the same diseases，but in nature the weak would die and the strong would survive可知，克隆会破坏自然界的规律。答案：C4解析：文章的第二、三、四段都是在介绍植物克隆的好处所以本文的目的是介绍植物克隆的好处。答案：D.书面表达假如你是Tom，请根据下面表格中的内容提示，用英文给一家英文报社的编辑写一封信，告诉他你们班同学对克隆的不同观点，并表达自己的看法。(词数120左右)赞成的理由反对的理由你的观点1.克隆技术可挽救濒危生物2.可再造人体器官用来移植，为老年人和病人带来福音1.克隆人容易提前衰老和死亡2.克隆人的出现会使社会混乱_范文：Dear editor，Recently in my class there is a heated debate about “to clone or not to clone”. The students for cloning say that cloning can help to save the wildlife in danger, and we can have more and more wildlife in the world, and it can also help the old and the sick, for example, some cloned organs can be transplanted into their bodies.However, the students against it say that cloning can speed up the rate of growing and death. Whats worse, cloning can make our society confused. There would be two or mor