1、课时跟踪练(一) Welcome to the unit & Reading.阅读理解APlant 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 t
2、han 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 o
3、r individual growers always have the best seeds available. With more 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 (免疫的) to t
4、he 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 vegeta
5、bles of superior nutritional quality. This could make for a healthier population overall. This is already being 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 f
6、rom 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.语篇解读：本文主要讲了克隆植物的好处：增加农作物产量、提高植物的免疫力、提高水果和蔬菜的质量等。1The und
7、erlined word “optimized” in Paragraph 2 can be replaced by “ ”AenlargedBproducedCperfected Dexamined解析：选C词义猜测题。根据第二段中该词的下文“growers always have the best seeds available”种植者可以有最好的种子使用可猜测该词意为“好的或优的”。2According to the text, cloned plants .Ahave lower yield than normal plantsBhave a short growth cycle Cr
8、esist various kinds of diseasesDneed little care from people 解析：选B推理判断题。根据第二段第二句可知，克隆植物繁殖快，从种植到收获，间隔时间短，也就是生长周期短。3What can we infer from the text?AThe fruits produced by cloned plants taste much better.BThere are more cloned plants than normal plants.CPlant cloning can disturb the laws of nature.DPe
9、ople should avoid eating cloned fruits.解析：选C推理判断题。根据最后一段可知，克隆植物会造出完全一样的植物，它们也可能会患上同样的病。这与自然中适者生存的法则是相反的。所以说克隆植物可以打破自然法则。4What is the main purpose of the text?ATo warn the negative effects of plant cloning.BTo present different kinds of plant cloning.CTo predict the future of plant cloning.DTo inform
10、 us about the advantages of plant cloning.解析：选D写作意图题。根据各段的段首句可知，本文主要讲的克隆植物的好处：增加农作物的产量、提高植物的免疫力、提高水果和蔬菜的质量和利于人类的繁衍等。B With an eye for style and a heart for the environment, 18yearold Alexis Giger launched a doityourself blog aimed at “reducing your environmental impact fashionably”The idea was spark
11、ed (激发) by the ecology unit in her biology class at Charlotte Latin School last year, she said, which taught her about issues like deforestation and habitat destruction.“I started thinking about what I could do to stop the wastefulness in my immediate community，” the fashion lover said. “The blog, ,
12、 aims to make reusing secondhand goods store finds or last seasons pieces easy and fashionable while cutting down on the resources consumed by garment production，” Alexis said. Through online research, she discovered that a simple cotton Tshirt takes more than 700 gallons of water to make. “It made
13、me realize that the fashion industry consumes huge amounts of natural resources as it relies on producing garments quickly and in large supply many of the garments are only intended to be worn three or four times，” she said. Alexis had a number of tools to help her get started. Her mom, Kimberly, ta
14、ught her to sew when she was 5. Her grandmother taught her to crochet (钩边) around the same time. Alexis said she also gained technical knowledge and inspiration from her parttime job at a clothing company that creates theater wardrobes for schools and drama productions.Prior to the blog launch, she
15、spent several months illustrating “recycling” projects by creating photo tutorials. Though Ecouturier hasnt been online long, shes been getting positive feedback.“Ive had people come up to me in the hall and say，Hey, I saw your blog. Im working on one of the projects right now，” Alexis said.She said
16、 she hasnt bought a brandnew piece of clothing since last July, and her thrift store shopping has paid off with finds such as a $5 (31 yuan) dress she wore to homecoming.“Taking an hour from Saturday afternoon to make something for yourself can really have an impact on the environment. A little chan
17、ge every day can really add up，” Alexis said.语篇解读：本文讲述了一个女生为保护环境，防止资源浪费而开通了一个博客号召大家保护环境的故事。5What inspired Alexis to launch a doityourself blog?AHer talent at making handicrafts.BHer fascination with the fashion industry.CHer parttime work experiences.DHer growing concern for the environment after ta
18、king a biology class.解析：选D细节理解题。根据文中第二段第一句话“The idea was sparked (激发) by the ecology unit in her biology class at Charlotte Latin School last year”可知，创建博客的想法是由生物课引发的，故选D。6What is the content of the blog Alexis set up?AIt sells items made from thrift store finds.BIt teaches people how to choose thrif
19、t store goods.CIt encourages people to remake their clothing in a cool way.DIt informs people of the bad effects of deforestation and habitat destruction.解析：选C细节理解题。根据文中第三段第一句话“.aims to make reusing secondhand goods store finds or last seasons pieces easy and fashionable .”可知，博客的内容是鼓励人们改造旧衣服，故选C。7Wh
20、ich of the following statements is TRUE according to the text?AIn order to promote her blog, Alexis is spending a lot of time online every day.BThe projects on Alexis blog have convinced some people to try recycling clothes themselves.CAlexis has been dreaming of working in the fashion industry sinc
21、e she was a child.DTo start the blog, Alexis learned from her mother and grandmother how to sew and crochet.解析：选B推理判断题。从文章倒数第三段第二句可知，作者没有花很长时间，故A错误；从文中倒数第三段最后一句可知有人看作者的博客并回收了衣服，故B正确；文中未提到C选项，故错误；根据文中第五段第二、三句可知，作者学钩边之类的并不是为了开博客，故D项错误。8Which of the following best describes Alexis?ACreative and respons
22、ible.BSmart and cooperative.CIndependent and humorous.DFashionable and amusing.解析：选A推理判断题。根据文章大意，作者利用博客来宣传旧衣改造，以此保护环境，可知作者不仅有保护环境的责任心，而且还有创造力，很聪明，但文中没有提到作者与他人的合作，故不涉及合作，也没有体现出作者的幽默感和有意思的地方，故选A。C In 2001, scientists at Texas A&M University successfully cloned a cat for the first time, but this copy c
23、at is no mirror image of the original. Copy Cat (CC) was the first cat ever cloned. In 2001, researchers at Texas A&M University created the clone from the DNA of a calico cat (三色猫) named Rainbow after a failed attempt at cloning a dog.Interestingly, Rainbow and Copy Cat are different in many ways.
24、Rainbows coat is brown，and white, while CCs is gray and white; Rainbow is shy, but CC is outgoing and curious.The differences in the two cats indicate that identical DNA wont necessarily create similar appearances or personalities because there are many other factors that contribute to both surface
25、characteristics and temperament (性情)CC has since gone on to have three healthy kittens via the natural method, and the research that led to her creation became the foundation for a Californiabased pet cloning company called Genetic Savings & Clone, Inc.However, the cat cloning project caused critici
26、sm from animal welfare groups, which pointed out that millions of cats are killed in shelters each year due to pet overpopulation. They argued that the large sums of money spent on creating more cats could be put to better use providing homes for strays.There are also objections to the cloning proce
27、ss itself. Many people consider cloning cruel, as it is a process that can lead to deformities and other problems, which is evident in the fact that many clones die within months or even days of creation.Much to the delight of animal welfare advocates, after cloning five cats in total，Genetic Saving
28、s & Clone shut down in 2006.The reason for the companys close was its inability to make its cloning technology affordable and thus accessible to mainstream consumers.语篇解读：本文是一篇说明文。文章主要讲述的是克隆猫所带来的令人惊讶的结果以及大众对她的看法。9What is the best title of the passage?ACloned Cats A Surprising Development on Technolo
29、gyBCloned Cats Cloning Produces Surprising ResultsCCloned Cats A Cruel Research in ScienceDCloned Cats A Project Caused Criticism解析：选B标题归纳题。根据文中的主题讲述的是克隆出来的猫在性格和外观上都有所不同，这是比较鲜明的特点，因此文章的标题应该体现这一点，因此选B。10Which of the following about CC is TRUE?AThe researchers failed in cloning it in 2001.BIts fur is
30、brown and white as the calico cat.CIt is outgoing and curious as Rainbow.DIt doesnt have similar personalities as Rainbow.解析：选D细节理解题。根据文中第三段“The differences in the two cats indicate that identical DNA wont necessarily create similar appearances or personalities”即可判断答案。11Whats the underlined word in
31、the 6th paragraph similar to?ACriticism. BWaste of money.CDisability. DOverpopulation.解析：选C词义猜测题。根据文中第六段“cruel, other problems”和“which is evident in the fact that many clones die within months or even days of creation”可判断许多人认为克隆残酷和造成残疾和许多问题，出现死亡，因此画线词指的是身体上的残疾。12The reason for the companys demise is
32、 that cloning is .Aa waste of moneyBcruel sometimesCinaccessible to most peopleDaffordable to consumers解析：选C细节理解题。根据文章最后一段“.its inability to make its cloning technology affordable and thus accessible to mainstream consumers.”可判断答案。.阅读七选五Here are tips for a successful speech from a professional speec
33、hwriter.No speech should last more than 20 minutes. _1_ The Sermon on the Mount, a collection of sayings and teachings of Jesus, for example, lasted hardly more than three minutes.Focus on one topic. Were human and tend to have lots of thoughts, opinions and ideas. You have to make proper selection.
34、 _2_ Include and expand only those that explain and support your viewpoint (观点)_3_ Its important to remember that your words must be hearable and understandable the first time out.Humour is vital. _4_ Ronald Reagan always wanted to joke at the start of a speech because he needed the quick victory of
35、 laughter. It helped him relax. It also helped the audience relax.Dont forget to say thanks. You should always, at the beginning of the speech, thank the person who invited you and introduced you. _5_ While youre doing it, the audience gets a chance to daydream and settle down. Theyre going to daydr
36、eam at some point anyway, and it may as well be before you get to the heart of your remarks.AChoose your words carefully.BAnd saying thanks at the beginning has a practical purpose.CFirst you have to work out what youre going to say.DEvery speech needs it, and you need it, too, probably at the beginning.EStick to one subject the future of the soccer club, for example.FThis process takes time, so start once you begin thinking about the speech.GThe more important the message is, the less time it requires to say it.答案：15GEADB
