Theideaofbeingabletowalkonwaterhaslonginterestedhumansg...
問題詳情:
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 mass 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 Basilicusbasilicus, a lizard (蜥蜴) native to Central and South America. It can run across water for a distance of several metres, avoiding getting wet by rapidly hitting the water's surface with its feet. The lizard will take as many as 20 steps 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: corn flour. By adding enough of this common thickening agent to water (and it does take a lot), you can create a “nonNewtonian” liquid that doesn't behave like normal water. Now, if the surface of the water is hit hard enough, particles(粒子) 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 corn flour.
Fun though all this may sound, it's still rather messy and better read 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 afterwards!
8. What do we know about Basilicusbasilicus from the passage?
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 water.
9. What is the function of the corn flour according to the passage?
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 move rapidly.
10. What is the author's attitude towards the idea of humans' walking on water?...
A. It is risky but beneficial.
B. It is interesting and worth trying.
C. It is crazy and cannot become a reality.
D. It is impractical though theoretically possible.
【回答】
CAD
知識點:閱讀理解
題型:閱讀理解
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設,若,則a=( )A.-1 B.0 C.2 D.3
問題詳情: 設,若,則a=( )A.-1 B.0 C.2 D.3【回答】D知識點:導數及其應用題型:選擇題...
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一部歐美資產階級*的紀錄片,介紹了各國通過立法手段來鞏固*成果,下列解說詞中說法錯誤的是A.英國頒佈了《權...
問題詳情:一部歐美資產階級*的紀錄片,介紹了各國通過立法手段來鞏固*成果,下列解說詞中說法錯誤的是A.英國頒佈了《權利法案》 B.美國*戰爭期間頒佈《*宣言》C.法國大*期間頒佈《*宣言》 D.美國南北戰爭期間頒佈《1787年憲法》【回答】D知...
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對於鋅一銅一稀硫*組成的原電池裝置中,當導線中有1mol電子通過時,理論上的兩極變化是( )。 ①鋅片...
問題詳情:對於鋅一銅一稀硫*組成的原電池裝置中,當導線中有1mol電子通過時,理論上的兩極變化是( )。 ①鋅片溶解了32.5g②鋅片增重32.5g③銅片上析出lgH2 ④銅片上析出1molH2 A.①和③ B.①和④ C.②和③ D.②和④【回答】A知識...
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某有機物結構簡式為,下列關於該有機物的說法中不正確的是( )A.遇FeCl3溶液顯紫*B.與足量的*氧化*溶...
問題詳情:某有機物結構簡式為,下列關於該有機物的說法中不正確的是()A.遇FeCl3溶液顯紫*B.與足量的*氧化*溶液在一定條件下反應,最多消耗NaOH3molC.能發生縮聚反應和加聚反應D.1mol該有機物與溴發生加成反應,最多消耗1molBr2【回答】解析A項,有機物分子中存在*羥基,所以...
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