题目内容

3.The idea of being able to walk on water has long interested humans greatly.Sadly,biological facts prevent us ever accomplishing such a thing without artificial aid--we simply weigh too much,and all our mm pushes down through our relatively small feet,resulting in a lot of pressure that makes us sink.
However,several types of animals can walk on water.One of the most interesting is the common basilisk Basilicus basilicus,a lizard (蜥蜴) native to Central and South America.It can run across water for a distance of several meters,avoiding getting wet by rapidly hitting the water's surface with its feet.The lizard will take as many as 20steps per second to keep moving forward.For humans to do this,we'd need huge feet that we could bring up to our ears in order to create
adequate"hitting."
But fortunately there is an alternative:cornflour.By adding enough of this common thickening agent to water (and it does take a lot),you can create a"non-Newtonian"liquid that doesn't behave like normal water.Now,if the surface of the water is hit hard enough,particles(微粒) in the water group together for a moment to make the surface hard.Move quickly enough and put enough force into each step,and you really can walk across the surface of an adequately thick liquid of cornflour.
Fun though all this may sound,it's still rather messy md better mad about in theory than carried out in practice,if you must do it,then keep the water wings handy in case you start to sink--and take a shower afterward!
44.Walking on water hasn't become a reality mainly because humansB
A.are not interested in it
B.have biological limitations
C.have not invented proper tools
D.are afraid to make an attempt
45.What do we know about Basiilius basilicus from the passage?C
A.It is light enough to walk on water.
B.Its huge feet enable it to stay above water.
C.It can run  across water at a certain speed.
D.Its unique skin keeps it from getting wet in watch
46,What is the function of the cornflour according to the passage?A
A.To create a thick liquid.
B.To turn the water into solid.
C.To help the liquid behave normally.
D.To enable the water to rove rapidly.
47.What is the author's attitude toward the idea of humans'walking on water?D
A,It is risky but beneficial.
Il.It is interesting and worth trying.
C.It is crazy md cannot become a reality.
D.It is impractical thigh theoretically possible.

分析 本文是说明文.主要讲述人类有一个一直感兴趣但一直未能实现的愿望:水上行走.不能实现的原因是"生物性局限".本文主要介绍了一种理论上可行实际上难以实现的人类水上行走的方法:借助玉米粉(corn flour)增加水面浓度.

解答 44.B    考查细节理解.从第一段"Sadly,biological facts prevent us ever accomplishing such a thing without artificial aid …"可知,人类至今不能在水面行走是"生物"原因.故选择B.
45.C    考查细节理解.从第二段"It can run across water for a distance of several meters,avoiding getting wet by rapidly hitting the water's surface with its feet."可知,这种蜥蜴能在水面行走是因为速度快(每秒钟达到20步).故选择 C.
46.A    考查细节理解.第三段"this common thickening agent"明确这是一种"常见的增稠剂".故选择A.
47.D    考查态度判断题.从第二段"it does take a lot"及最后一段"it's still rather messy and better read about in theory than carried out in practice."等句推断,借助增稠剂实现人类在水面行走,理论上可行但真正实现很难做到.故选择D项.

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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In the Netherlands,bicycles outnumber the population of 17 million by at least one million and there are some 25,000 km of bicycle path in the country.Those statistics are set to grow as more and more people take to two-wheeled transport,leading to an increased risk of injury.
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D.improve safety for elderly cyclists
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D.The onboard computer.
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D.A good first impression increases sales.
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15.Multitasking
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Adam Gazzaley,a researcher at the University of California,San Francisco,who was not a member of the research group,said one limitation of the study was that it couldn't find out whether people who start out less focusedtoward multitasking or whether people's recognizing and understanding abilities change as a result of multitasking.
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67.The research led by Sanbonmatsu indicates that people who multitaskD.
A.seek high productivity constantly
B.prefer handling different things when getting bored
C.are more focused when doing many things at a time
D.have the poorest results in doing various things at the same time
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A.assessed the multitasking ability of the students
B.evaluated the academic achievements of the students
C.analyzed the effects of the participants'tricky mental tasks
D.measured the changes of the students'understanding ability
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A.limited power in calculation
B.interests in doing things differently
C.inability to concentrate on one task 
D.impulsive desire to try new things
70.From the last paragraph,we can learn that multitaskers usuallyC.
A.drive very skillfully
B.go in for different tasks
C.fail to react quickly to potential dangers
D.refuse to explain the reasons for their behavior.

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