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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、observe
B、observes
C、observing
D、to observe
答案D
解析 and后面的成分应该是不定式，因为此处and连接的并列成分是to measure...and to observe…。原句意为“当从太空所做的观察使得测量地球的能源及观察这些能源利用得是否合理成为可能时，人类就会受益”。故D为正确答案。
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