2. 外语
  3. It has been necessary to refer repeatedly to the effects of the two world wars in promoting all kinds of innovation. It should b

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

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问题    It has been necessary to refer repeatedly to the effects of the two world wars in promoting all kinds of innovation. It should be 【C1】______ also that technological innovations have 【C2】______ the character of war itself by 【C3】______ of new mechanical and chemical devices. One weapon developed during World War Ⅱ 【C4】______ a special mention. The 【C5】______ of rocket propulsion was well known earlier, and Us possibilities as a 【C6】______ of achieving speeds sufficient to escape from the Earth’ s gravitational pull had been 【C7】______ by the Russian and the American scientists.
   The latter built experimental liquid-fuelled rockets in 1926. 【C8】______ , a group of German and Romanian pioneers was working 【C9】______ the same lines, and in the 1930s, it was tins team that developed a rocket 【C10】______ of delivering a warhead hundreds miles away. Reaching a height of over 100 miles, the V-2 rocket 【C11】______ the beginning of the Space Age, and members of its design team were 【C12】______ in both the Soviet and United States space programs after the war.
   Technology had a tremendous social 【C13】______ in the period 1900-45. The automobile and electric power, 【C14】______ , radically changed both the scale and the quality of 20th-century life, 【C15】______ a process of rapid urbanization and a virtual revolution 【C16】______ living through mass production of household goods and 【C17】______ . The rapid development of the airplane, the cinema, and radio made the world seem suddenly smaller and more 【C18】______ . The development of many products of the chemical industry further transformed the life of most people. In the years 【C19】______ 1945 the constructive and creative opportunities of modern technology could be 【C20】______ , although the process has not been without its problems.  
【C3】______
选项 A、introduction
B、innovation
C、elimination
D、alteration
答案A
解析 根据下文提示，此处应选introduction，表示引进这些新事物。
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