PAGE 第 12 页 共 12 页 Unit 2 单元质量检测（二） (时间：100分钟 满分：120分) 选择题部分 Ⅰ.阅读理解(共10小题；每小题2.5分，满分25分) 阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。 A Research advances over the past decade have told us that, with a little work, we humans can clone just anything we want, from frogs to monkeys and probably even ourselves! So, we can clone things, but why would we want to Let's look at some of the reasons people give to justify cloning. 1．Cloning for medical purposes Of all the reasons, cloning for medical purposes has the most potential to benefit a large number of people. Cloning technologies might reduce the time needed to make a transgenic animal model, and the result would be a population of genetically identical animals for study. 2．Cloning stem cells for research Stem cells are the body's building blocks which might be used to repair damaged or diseased organs and tissues. Researchers are currently looking on cloning as a way to create genetically defined human stem cells for research and medical purposes. 3．Reviving endangered or extinct species The dinosaur was an extinct species. Could we really clone dinosaurs In theory Yes. What would you need to do this A well preserved source of DNA from the extinct dinosaur, and a closely related species, currently living, that could serve as a surrogate (代用的) mother. In reality Probably not. It's not likely that dinosaur DNA could survive undamaged for such a long time. However, scientists have tried to clone species that became extinct more recently, using DNA from well preserved tissue samples. 4．Cloning humans Why would anyone want to clone humans Some reasons are to help infertile_couples have children or to replace a deceased child. However, there are the risks involved. For example, how sure can we be that a cloned baby will be healthy or what might go wrong 1．What's the main idea of the whole passage A．Why people want to use cloning. B．How to clone animals. C．Cloning is of great use for people and animals. D．The development of cloning. 2．Which of the following is TRUE according to the passage A．Cloning is mainly used for cloning human beings. B．In the far future, we will have the live dinosaurs on earth. C．Cloning human beings may cause a lot of trouble. D．Genetically human stem cells are used for cloning human beings. 3．The underlined phrase “infertile couples” in the last paragraph probably means _____. A．couples who just married B．couples who are unable to bear children C．couples who don't like bearing children D．couples who want to bear more children B Do you have lunch at school Do you like having lunch at school School dinners (that means“lunch”) are a hot topic in the UK these days and there are lots of different opinions about what young people eat at lunchtime. Some people think that school meals are unhealthy; some people say that they are much better than in the past and others say that midday meals should be ... ...
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