2015年职称英语考试(理工类)完形填空专练(1)

　　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