Invisibility Ring
When a person sees an object,his 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. So,to make an object invisible,scientists have to keep waves from bouncing off it.And they have to make sure the objectcasts no shadow.Otherwise,the 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 thering,very few bounce off it.Instead,they pass through the ring,which 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 ring,it,too,is nearly invisible. However,the cloaking device and anything inside it do cast a pale shadow.And the deviceworks only for microwaves,not for visible light or any kind of electromagnetic radiation.So,Harry 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5ri:kEn5strQktp
radiantadj.辐射的 wavelengthn.波长
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。
国外孩子们是如何看待川普当选美国总统的?
2016年12月四级作文预测范文:汉语热
美文赏析:不要等着幸福到来,幸福是条路!
特朗普的大女儿伊万卡的演讲,第一秒就爱上了她
英语六级考试作文范文:偶像
英语美文:最伟大的爱是不求回报又不留痕迹
如何用英语告诉别人 你没空?
“起床气”英语咋说?
美文赏析:别急于做判断,这样才能看得真切
2016年6月英语六级作文答案:机器人(有道版)
如何面对大城市堵车难题? How to Deal With Traffic Jam in Metropolis?
农民应进城做工吗? Should Peasants Go to cities to Find a Job?
大学英语四级考试作文范文:挫折
看律政剧必备的法庭词汇(1)
英语六级书信类祚文:建议信
不要再对妈妈大吼大叫Stop Yelling to Mother
英语六级英语作文范文:空巢老人
《神奇动物在哪里》中文预告片
国际护士节 International Nurses Day
英语六级作文范文:学历与能力,哪个重要?
美文赏析:珍惜当下,因为失去总是猝不及防
大学英语六级考试预测范文:大学生该不该追求名牌?
2016年6月英语六级作文答案:虚拟世界(新东方版)
如何在酒吧与老外聊天
患难见真情 A Friend in Need Is a Friend Indeed
大学英语作文预测范文:抑郁症或者消极心态
多媒体技术与教育 Multimedia Technology and Education
课本上学不到的口语表达第三波
2016年12月英语四级作文预测:制定目标的重要性
美文赏析:想家的你,需要自己抚慰自己的心
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |