It has been necessary to refer repeatedly to the effects of the two world wars in promoting all kind of innovation. It should be

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问题     It has been necessary to refer repeatedly to the effects of the two world wars in promoting all kind of innovation. It should be (1)_____ also that technological innovations have (2)_____ the character of war itself by the (3)_____ of new mechanical and chemical device. One weapon developed during World War II (4)_____ a special mention. The (5)_____ of rocket propulsions was well known earlier, and its possibilities as a (6)_____ of achieving speeds sufficient to escape from the Earth’s gravitational pull had been (7)_____ by the Russian and the American scientists. The latter built experimental liquid-fuelled rockets in 1926. (8)_____, a group of German and Romanian pioneers was working (9)_____ the same lines and in the 1930s, it was this team that developed a rocket (10)_____ of delivering a warhead hundreds of miles away. Reaching a height of over 100 miles, the V-2 rocket (11)_____ the beginning of the Space Age, and members of its design team were (12)_____ in both the Soviet and United States space programs after the war.
    Technology had a tremendous social (13)_____ in the period 1900 1945. The automobile and electric power, (14)_____, radically changed both the scale and the quality of 20th-century life, (15)_____ a process of rapid urbanization and a virtual revolution (16)_____ living through mass production of household goods and (17)_____
    The rapid development of the airplane, the cinema, and radio made the world seem suddenly smaller and more (18)_____. The development of many products of the chemical industry further transformed the life of most people. In the years (19)_____ 1945 the constructive and creative opportunities of modern technology could be (20)_____, although the process has not been without its problems.

选项 A、introduction
B、innovation
C、elimination
D、alteration

答案A

解析 根据下文"新的机械和化学装置(new mechanical and chemical devices)"提示,此处introduction(引进,采用)最符合题意。其余选项:innovation改革,革新;elimination根除,消灭;alteration修改。
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