Invisibility Ring Scientists cant yet make an invisibility cloak1 like the one that Harry Potter2 uses.But,for the first time,theyve constructed a simple cloaking device that makes itself and somethingplaced inside it invisible to microwaves. Invisibility isnt possible yet with waves of light that the human eye can see.But it is nowpossible with microwaves.Like visible light,microwaves are a form of radiant energy.Theyare part of the electromagnetic spectrum,which also includes radio waves,infrared light,ultraviolet rays,X rays,and gamma rays.The wavelengths of microwaves are shorter thanthose of radio waves but longer than those of visible light. To a detector set up to receive microwaves on the other side of the ring,it looks as if thewaves never changed their paths as if there were no object in the way! So,the ring is effectively invisible. 练习: Acan now make an invisible cloak of the same kind as he uses. Ctry to invent a device Similar in idea to the invisible cloak he uses. 2.What is true of microwaves? BTheir wavelengths are longer than those of visible light. DThey are visible to the human eye. AIt is made of a special material with unusual ability. CMicrowaves pass through it when they strike it. side. AA disk or plate placed under a drinking glass to protect a table top. CA roller coaster. 5.Harry Potters invisibility cloak doesnt have any real competition yet, Ascientists have not found out how his cloak works. Cthe cloaking device works only for microwaves. 答案与题解: 2.B第三段最后一句中告诉我们,A是错误选择,B是正确选择。该段第三句说,微波与可见光一样都是一种辐射能,所以C的说法是错误的,不能选择;根据该段第一句:with wavesof light that the human eye can see和第三句:Like visible light,可以得知D是错误的说法,也不能选择。 4.A第四段第一句告诉我们,科学家的这个隐形装置和一个杯垫差不多大小,所以A是正确选择。coaster是一个多义词,其他几个选择是该词的其他意思,B:从事沿海贸易的船;C:过山车,摩天轮;D:海岸地区居民。
2015职称英语考试卫生A真题及答案:词汇选项
职称英语考试2007真题卫生A级:补全短文
职称英语考试2007真题卫生A级:阅读判断
职称英语a级真题2006卫生类真题及答案解析汇总
职称英语a真题2005年卫生类:补全短文
2015职称英语考试卫生类A级真题及答案:完形填空
2012年职称英语考试理工类C级概括大意
职称英语考试2007真题卫生A级:阅读理解
职称英语2009真题卫生类A级补全短文
2012年职称英语考试理工类C级阅读判断
职称英语2009真题卫生类A级完形填空
职称英语a真题2005年卫生类:阅读理解
卫生类职称英语历年真题解析2008年A阅读理解
2012年职称英语考试理工C完型填空
职称英语考试2007真题卫生A级:完形填空
2015职称英语考试卫生类A级真题及答案解析:阅读理解
职称英语a真题2005年卫生类:词汇选项
职称英语a级真题2006卫生类补全短文
职称英语a级真题2006卫生类概括大意与完成句子
职称英语2009真题卫生类A级参考答案
卫生类职称英语历年真题解析2008年A:真题及解析汇总
卫生类职称英语历年真题解析2008年A补全短文
职称英语a级真题2006卫生类阅读理解
2012年职称英语考试-理工类C级完形填空
卫生类职称英语历年真题解析2008年A参考答案
2015职称英语考试卫生类A级真题及答案:补全短文
职称英语a真题2005年卫生类:真题及答案解析汇总
职称英语a级真题2006卫生类完形填空
职称英语a真题2005年卫生类:阅读判断
2012年职称英语考试-理工类C级阅读理解
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |