Space Research

　　Does walking on the moon make life better for people on earth? 51 all the problems of our own world，why should we be spending huge 52 on trips to outer space? Such questions as these are often asked，especially 53 those whose tax money is paying for space explorations．The answers to these questions are many and 54 ．

　　Up to now，the practical benefits resulting 55 space research have included the development of new methods and skills，new processes，new services，new products，and even new companies created to make use of what 56 through space travel．Also among the benefits 57 better education (especially in scientific subjects)， 58 management，higher quality of industrial products，and rapid 59 growth．People all over the world are now served by 60 weather predictions，better communication systems，and better understanding of the earth and its environment．Everyone will benefit 61 observations from space make 62 possible to measure the earth’s resources and 63 whether or not they are being used properly． 64 the space program will help our world deal with the problems of the environment．It has already brought a new appreciation of the complex system 65 man is only a part．

　　In addition to improving the quality of existing products，the space program has been responsible for the development and improvement of new ones．The most important is the computer．To bring the endangered Apollo 13 astronauts home safely in 1970，a new flight plan had to be made taking account of an unbelievably complex combination of elements．The computer accomplished this task in seventy-two minutes，whereas a man or a woman working with pencil and paper take more than a million years! If there had been no space program，it is doubtful that computers would now be so widely used in industry and government．

　　51．A．Consider B．Considering C．Considered D．Having considered

　　52．A．totals B．money C．sums D．dollars

　　53．A．to B．for C．by D．/

　　54．A．various B．variable C．varied D．variant

　　55．A．from B．in C．out of D．by

　　56．A．has learned B．has been learned C．is learned D．can 1eam

　　57．A．is B．a(chǎn)re C．has D．was

　　58．A．effective B．efficient C．more effective D．effect

　　59．A．economic B．economical C．economics D．economy

　　60．A．improve B．improving C．improved D．being improved

　　6l．A．a(chǎn)s B．unless C．a(chǎn)lthough D．though

　　62．A．that B．it C．which D．/

　　63．A．observe B．observes C．observing D．to observe

　　64．A．Increasing B．Increased C．Increasingly D．To increase

　　65．A．which B．for which C．a(chǎn)mong which D．of which

　　答案51．B 52.C 53．C 54．A 55．A 56．B 57．B 58．C 59．A 60．C 61．A 62.B 63．D 64．C 65.D

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