分析 本文是一篇说明文,主要讲述了一个人同时从事多项活动的工作效率问题,一些很好的大脑训练就涉及到让大脑一次接受二个或更多个挑战.但很多时候,一心多用往往会降低而不是提高效率.研究表明,一心多用会导致压力增加、焦虑和记忆力减退.研究还发现,一心多用,与他们一次只做一件事情时相比,工作效率下降了.同时做两件或多件需要留神的事情时,人们往往会出错.同时处理几个细节问题时,我们常会忘事.精神不集中,可能对新的信息注意力就不够,于是这些新信息就根本没贮存到记忆中去.
解答 49.A 推理判断.根据第一段的内容可知,作者提出:"In fact,some excellent mental aerobic exercises (大脑训练) involve engaging the brainin two or more challenging activities at a time.",之后用although引出转折,这种训练有时并不能productive.所以选择A.有部分人认为这种大脑的训练能够帮助他们高效的工作.
50.B 细节理解.根据"this front part of the brainactually takes a moment of rest between tasks",可以推断出之后的"ifyou've ever dialed (拨电话) a phone number and suddenly forgotten who youdialed when the line is answered"的情况,所以选择B.
51.A 细节理解.根据第三段内容,特别是最后一句话可知当人在同时从事两项或多项需要花费精力的工作时,常常会出错.故选择A.
52.B 主旨大意.最后一段中作者继续描述了之前的观点:一个人同时从事多项工作会出现很多问题.回到整篇文章,作者主要观点就是告诉大家:多项工作不能产生高效的结果,故选择B.
点评 解答细节理解题时,一个常用的方法就是运用定位法,即根据题干和选项中的关键词从原文中找到相关的句子,与选项进行比较从而确定答案;推理判断题既要求学生透过文章表面文字信息推测文章隐含意思,又要求学生对作者的态度、意图及文章细节的发展作正确的推理判断,力求从作者的角度去考虑,不要固守自己的看法或观点.
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