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(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 cornflour.

　　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 afterward!

　　1．Walking on water hasn’t become a reality mainly because humans ________．

　　A．are not interested in it

　　B．have biological limitations

　　C．have not invented proper tools

　　D．are afraid to make an attempt

　　2．What do we know about Basilicus basilicus 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.

　　3．What is the function of the cornflour according to the passage?

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