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．a(chǎn)re not interested in it
B．have biological limitations
C．have not invented proper tools
D．a(chǎn)re 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 本文是說(shuō)明文．主要講述人類(lèi)有一個(gè)一直感興趣但一直未能實(shí)現(xiàn)的愿望：水上行走．不能實(shí)現(xiàn)的原因是"生物性局限"．本文主要介紹了一種理論上可行實(shí)際上難以實(shí)現(xiàn)的人類(lèi)水上行走的方法：借助玉米粉（corn flour）增加水面濃度．

解答 44．B    考查細(xì)節(jié)理解．從第一段"Sadly，biological facts prevent us ever accomplishing such a thing without artificial aid …"可知，人類(lèi)至今不能在水面行走是"生物"原因．故選擇B．
45．C    考查細(xì)節(jié)理解．從第二段"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，這種蜥蜴能在水面行走是因?yàn)樗俣瓤欤棵腌娺_(dá)到20步）．故選擇 C．
46．A    考查細(xì)節(jié)理解．第三段"this common thickening agent"明確這是一種"常見(jiàn)的增稠劑"．故選擇A．
47．D    考查態(tài)度判斷題．從第二段"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．"等句推斷，借助增稠劑實(shí)現(xiàn)人類(lèi)在水面行走，理論上可行但真正實(shí)現(xiàn)很難做到．故選擇D項(xiàng)．

點(diǎn)評(píng) 解答細(xì)節(jié)理解題時(shí)，一個(gè)常用的方法就是運(yùn)用定位法，即根據(jù)題干和選項(xiàng)中的關(guān)鍵詞從原文中找到相關(guān)的句子，與選項(xiàng)進(jìn)行比較從而確定答案；推理判斷題既要求學(xué)生透過(guò)文章表面文字信息推測(cè)文章隱含意思，又要求學(xué)生對(duì)作者的態(tài)度、意圖及文章細(xì)節(jié)的發(fā)展作正確的推理判斷，力求從作者的角度去考慮，不要固守自己的看法或觀點(diǎn)．

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