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[职称英语阅读理解] 2013职称英语理工类的B级阅读理解通关习题4

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  阅读理解:

  When a person sees an objecthis or her eye senses many different waves of visiblelight as they bounce off the object.The eye and brain then work together to organize thesesensations and reconstruct the objects original shape. Soto make an object invisiblescientists have to keep waves from bouncing off it.And they have to make sure the objectcasts no shadow.Otherwisethe absence of reflected light on one side would give the obiectaway.

  The scientists new invisibility device is the size of a drink coaster and shaped like aring.The ring is made of a special material with unusual ability.When microwaves strike theringvery few bounce off it.Insteadthey pass through the ringwhich bends the waves allthe way around until they reach the opposite side.The waves then return to their originalpaths.

  When the researchers put a small cdpper loop inside the ringittoois nearly invisible. Howeverthe cloaking device and anything inside it do cast a pale shadow.And the deviceworks only for microwavesnot for visible light or any kind of electromagnetic radiation.SoHarry Potters invisibility cloak doesnt have any real competition yet.

  invisibilityn.看不见,无形 spectrumn.光谱

  microwaven.微波 ultraviolet ray 紫外线

  radiantadj.辐射的 wavelengthn.波长

  练习:

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