分析 本文主要介绍了人类的嗅觉基因和嗅觉系统.科学家们通过研究嗅觉基因和嗅觉系统是如何工作的,发现了嗅觉在我们的生活中起着非常重要的作用.
解答 63.C 细节理解题.根据第三段These two scientists were the first to describe the family of 1,000olfactory (嗅觉) genes and to explain how our olfactory system works.可知理查德•阿克塞尔和琳达•巴克研究了家庭嗅觉基因并解释了我们的嗅觉系统是如何工作的.由此推知,这两位科学家发现了人类嗅觉系统的本质.故选C.
64.C 细节理解题.根据第五段Similarly,the smells of lemon and coffee appeared to promote clear thinking and mental focus.可知喝咖啡有助于提高思考和注意力.故选C.
65.C 推理判断题.根据最后一段their study shows that nearly every human being shows a different pattern of active and inactive smell-detecting receptors.可知不同的人对不同的气味敏感.故选C.
66.B 主旨大意题.本文主要介绍了嗅觉基因和嗅觉系统.研究者发现嗅觉在我们的生活中起着非常重要的作用.故选B.
点评 本文考察学生的理解推断能力以及细心程度,只要抓住文章的关键词,采用寻读的方法查找细节,就能找到正确答案.
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增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
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删除:把多余的词用斜线(\)划掉。
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