Why is the two scientists work so important to science?
In the 1920s,Satyendra Nath Bose was studying an interesting ____about special light particleswe now call photons.Bose had trouble ____ other scientists to believe his theory,so he contacted Albert Einstein.Einsteins calculations helped him theorize that atoms ____behave as Bose thought-but only at very cold temperatures.
Scientists have also discovered that ultra-coldatoms can help them make the worlds atomic clocks even ____accurate.These clocks are so accurate today they would only lose one second ____six million years! Such accuracy will help us travel in space because distance is velocity times time.With the long distances involved in space ____,we need to know time as accurately as possible to get accurate distance.
51.A. operated B. opened C. offered D. occurred
52.A. space B. star C. Earth D. planet
53.A. where B. what C. when D. whether
54.A. sadly B. repeatedly C. Freely D. safely
55.A. energy B. year C. system D. rays
56.A. by B. along C. away D. With
57.A. location B education C status D knowledge
58.A. interesting B. impossible C. reasonable D. necessary
59.A. burnt B. cooled C. blown D. cut
60.A. invention B. experiment C. paper D. theory
61.A. forcing B. begging C. convincing D. ordering
62.A. will B. would C. must D. need
63.A. that B. such C. more D. much
64.A. every B. any C. each D. some
65.A. station B. craft C. age D. travel
答案:DADDC CABBD CBCAD
最喜爱的作家—郭敬明(Favourite Writer--Guo Jingming)
为祖国而学习(Study for our motherland)
电脑能代替纸笔吗?(Can Computers Replace Paper and Pen?)
写一篇旅游日记
电脑游戏(Computer game)
中考英语作文范文--早起
羞愧(Ashamed)
怎样保持健康的身体(How to Keep Healthy)
保护我们的城市(Saving Our City)
露营(Camping)
我最尊敬的人(The Man I Respect Most)
中考英语书面表达写作常识
以我的学校为骄傲(Be Proud of My School)
电脑游戏与我们的视力(Computer games and our eyesight)
有必要进行空间探索吗?(Do We Need Space Exploration)
关于环境保护(水资源节约)的话题
有关于网络的话题
作为一个学生或中国人,你能为2008 奥运会做些什么?
第二课堂之我见(Comments on the Second Class)
关于怎样学好英语的话题(How to learn English well?)
谈谈自己的爱好(My hobby)
中考英语考前必备--现象说明文写作模板
便条(1)
去西山植树
自由与和平的象征(Represent of Freedom and Peace)
2001年江西中考英语作文
根据下面一则广告词写一篇文章说明水的重要性
我的房子(My Flat)
商业书信(The Business Letter)
电脑游戏与我们的健康(Computer games and our health)
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英语教案 |
英语课件 |
英语试题 |
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