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  3. Does walking on the moon make life better for people on earth? (41) all the problems of our own world, why should we be spendi

Does walking on the moon make life better for people on earth? (41) all the problems of our own world, why should we be spendi

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问题     Does walking on the moon make life better for people on earth?  (41)  all the problems of our own world, why should we be spending huge sums on trips to outer space? Such questions as these are often asked, especially  (42)  those whose tax money is paying for space explorations. The answers to these questions are many and varied.
   Up to now, the practical benefits resulting  (43)  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  (44)  through space travel. Also among the benefits are better education (especially in scientific subjects),  (45)  management, higher quality of industrial products, and more rapid economic growth. People all over the world are now served by  (46)  weather predictions, better communication systems, and better understanding of the earth and its environment. Everyone will benefit  (47)  observations from space make it possible to measure the earth’s resources and  (48)  whether or not they are being used properly.  (49)  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  (50)  man is only a part.
选项 A、improve
B、improving
C、improved
D、being improved
答案C
解析 本句介词by后面的宾语是三个名词短语。improved意为“被改进了的”，与后面两个better构成平行结构。本句大意为：全世界的人们现在都得益于改进了的天气预测法，更好的交流系统……。因此，C为正确答案。
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