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2017英语等级考试pets五级备考训练
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1. The case of Ashanthi Desilva is mentioned in the text to _______。
[ A ] show the promise of gene-therapy
[ B ] give an example of modem treatment for fatal diseases
[ C ] introduce the achievement of Anderson and his team
[ D ] explain how gene-based treatment works
2. Anderson’s early success has_______。
[ A ] greatly speeded the development of medicine
[ B ] brought no immediate progress in the research of gene-therapy
[ C ] promised a cure to every disease
[ D ] made him a national hero
3. Which of the following is true according to the text?
[ A ] Ashanthi needs to receive gene-therapy treatment constantly.
[ B ] Despite the huge funding, gene researches have shown few promises.
[ C ] Therapeutic genes are carried by harmless viruses.
[ D ] Gene-doping is encouraged by world agencies to help athletes get better scores.
4. The word “tarnish” (line 4, paragraph 4) most probably means _______。
[ A ] affect
[ B ] warn
[ C ] trouble
[ D ] stain
5. From the text we can see that the author seems _______。
[ A ] optimistic
[ B ] pessimistic
[ C ] troubled
[ D ] uncertain
本篇文章是说明文，主要说明基因疗法的前景、现状、遭遇的问题以及人们对待基因疗法的态度。文章第一段以上世纪90年代一次成功的基因治疗为例说明基因疗法的广阔前景。第二段介绍了基因疗法的现状和治疗机制。第三段介绍了目前用基因疗法治疗多种疾病的研究情况。第四段介绍了基因疗法遭遇的问题以及人们对基因疗法的态度。
答案及解析
1.A【解析】文章第一句话对用基因疗法治疗Ashanthi所患罕见疾病的成功给予了很高的评价，并在第一段末指出医生们对基因疗法寄予了极高的期望。因此正确答案为A。
2.B【解析】文章第二段一开头就说：“It’s not entirely clear why medicine has been SO slow to build on Anderson’s early Success.”从时间上来看，Anderson采用基因疗法的成功尝试已经是l990年的事情了，两相对照，可见他的成功没有让医学加速发展。因此正确答案为B。
3.C【解析】文章第二段对于基因治疗的方式的解释是用于治疗的基因通过“viruses that don’t cause human disease”进人体内，就好像“特洛伊木马”一样，由此可见，这些病毒是无害的。因此正确答案为C。
4.D【解析】第四段提到基因疗法遭受的一起挫折—一个病人因接受基因疗法而死亡;接着讲专家担心运动员利用基因在比赛中作弊会进一步tarnish这一领域，从上下文逻辑推理，应该是“有损，玷污”这一类的意思，因此正确答案为D。
5.A【解析】作者的态度从文章第一句话和最后一句话就可以明显判断出来。第一句话说基因疗法是20世纪的伟大成就之一，最后一句话说“Everybody recognizes that gene therapy is a very good idea，由此可见作者对基因疗法持积极乐观的态度。因此正确答案为A。
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