题目内容
18.It may seem like a moment in a science fiction movie.In a fierce battle,a creature loses an arm but,then,grows another one to take its place.However,this is not science fiction.It is scientific fact.Some fish and amphibians,such as salamanders,can regrow lost limbs and organs.
As mammals evolved they lost the ability to regrow,or regenerate,parts of their body.However,experiments show that it may be possible to regain that ability.
Tropical freshwater zebrafish are popular pets.They are also popular as lab animals.Their embryos(胚胎) are clear,or translucent.They can regrow damaged fins,skin and hearts.Zebrafish are also genetically(基因地) similar to humans.
In 2013,the website Sci-News reported that researchers had found that 70per cent of"protein-coding human genes"are related to genes found in the zebrafish.The report also said that researchers at the Wellcome Trust Sanger Institute in Britain also found that 84per cent of genes known to be connected to human disease have a zebrafish counterpart.
Scientist Wang Yadong is one of the Pittsburg researchers.He and his team are studying the ability of zebrafish to regenerate limbs and organs.Wang says you can cut away about 20per cent of the zebrafish heart and it will regenerate.He add that same process may be able to help humans.
Scientists injected(注射) an"extracellular matrix,"or ECM,from the heart of a zebrafish into a severely damaged mouse heart.They found that the heart muscle regrew in days.They found something else.The healing was even faster when the ECM was taken from zebrafish that was itself in the process of re-growing damaged tissue.
12.The main reason why the zebrafish were chosen as lab animals is thatC.
A.they are popular pets
B.their bodies are clear to study
C.they are genetically similar to humans
D.they are easy to find for the researchers
13.What does the underlined word"counterpart"in Paragraph 5probably mean?A
A.A similar thing.
B.A different fish.
C.A human being.
D.A little mouse.
14.After injecting ECM from a zebrafish into the damaged mouse heart,what did scientists find?B
A.The zebrafish died quickly.
B.The mouse heart regrew in days.
C.The zebrafish heart regrew quickly.
D.The mouse healed more slowly than normal.
15.Where is the most probably taken from?D
A.A science fiction.
B.A guide book.
C.A fashion magazine.
D.A science report.
分析 本文介绍了科学家通过研究斑马鱼再生四肢器官的能力来为人类的健康服务.
解答 12.C 细节理解题.根据句子Zebrafish are also genetically(基因地) similar to humans.斑马鱼在遗传学上也与人类相似.所以答案选C.
13.A 猜测词义题.根据前一句 researchers had found that 70per cent of"protein-coding human genes"are related to genes found in the zebrafish.研究人员发现,70%的"人类基因编码蛋白质"相关的基因在斑马鱼中发现. 84per cent of genes known to be connected to human disease have a zebrafish counterpart.已知与人类疾病有关的基因有84%个是斑马鱼的基因应该是相似的,所以答案选A.
14.B 细节理解题.根据句子They found that the heart muscle regrew in days.他们发现心脏肌肉在几天里再生了,所以答案选B.
15.D 推理判断题.根据句子 However,this is not science fiction.It is scientific fact.然而,这不是科幻小说,而是科学事实.由答案选此可以推断出这是一个科学报道,所以选D.
点评 阅读理解题测试考生在阅读基础上的逻辑推理能力,要求考生根据文章所述事件的逻辑关系,对未说明的趋势或结局作出合理的推断;或根据作者所阐述的观点理论,对文章未涉及的现象、事例给以解释.考生首先要仔细阅读短文,完整了解信息,准确把握作者观点.
A. | the last straw | B. | a brave face | ||
C. | a tower of strength | D. | a ray of sunshine |
A. | wherever | B. | whichever | C. | whenever | D. | whatever |
A. | when | B. | that | C. | as | D. | as if |