分析 这是一篇介绍鲨鱼生活习性及特点的科普文.文章说到了鲨鱼的种类,危害性,生活习性等特点.
解答 51-55 CBAAC
51.C 细节理解题.People put nets around some beaches to protect swimmers.句意:人们在部分海滩围上网去保护游泳的人.由此句可知答案选C,围网的目的是保护游泳者的安全.
52.B 推理判断题.There are 30 kinds of sharks and 25 kinds of them are dangerous.句意:有30种鲨鱼,25种是危险的.由这个数据可以推算出危险鲨鱼占鲨鱼总数的比例超过80%,因此答案选B.
53.A 细节理解题.The jaws (大白鲨) and the tiger sharks are the most dangerous kinds of sharks.句意:大白鲨和虎鲨是鲨鱼中最危险的种类.由这句可知答案选A
54.A 词意猜测题.We must keep calm and don't make any noise when a shark is swimming near you.句意:当鲨鱼游近你的时候,我们必须保持镇静,并且不能发出任何响声.由后半句可知,鲨鱼对周围声音很敏感,不能发出任何响声才不会被它发现,由此推断划线单词应该是与安静有关的意思.分析四个选项,BD首先排除,而沉默多指不说话,不发言,而不是不发出任何声音的意思,因此排除C项,选A55.C.细节理解题.It will be too late if a shark can swim sixty kilometers an hour to you.句意:如果鲨鱼向你以每小时60公里的速度游来时,你逃生将是太晚了.故A项正确,排除.There are 30 kinds of sharks …句意:有30种鲨鱼…由此句可知B项正确,排除.Do you know all sharks must keep swimming,or they will go down?句意:你知道所有的鲨鱼必须一直游泳,否则他们会沉下去吗?由此句可知C项错误.If a shark loses a tooth,a new one will grow out very quickly.句意:如果鲨鱼掉了一颗牙,一颗新牙将会很快长出来.由此句可知D项正确.因此答案选C
点评 本题首先要通读全文,了解大意,紧紧抓住上下文语境所提供的信息,然后明确词意和词的搭配,并注意上下连贯,合乎逻辑,最后通读全文,细心检查.
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