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 the【C3】______ of new mechanical and chemical devices. One weapon developed【C4】______ World War II deserves a special mention. The【C5】______ of rocket propulsion (推进力) was wellknown earlier, and its possibilities as a 【C6】______ of achieving speeds sufficient to escape from the Earth’s gravitational (引力的) pull had been【C7】______ out by the Russian and the American scientists. The【C8】______ built an experimental liquid-fuelled rocket in 1926.【C9】______ , a group of German and Romanian pioneers was working across the same lines, and in the 1930s, it was this team that developed a rocket【C10】______ of delivering a warhead hundreds of 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—1945. The automobile and electric power, on the other hand, radically changed both the scale and the quality of 20th-century life,【C14】______ a process of rapid urbanization and a virtual revolution【C15】______  living through mass production of household goods and【C16】______ . The rapid development of the airplane, the cinema,【C17】______ radio made the world seem suddenly smaller and more【C18】______ . The development of many products of the chemical industry further transformed the life of【C19】______ people. In the years following 1945 the constructive and creative opportunities of modern technology could be exploited,【C20】______  the process has not been without its problems.  
【C20】
选项 A、although
B、however
C、because
D、but
答案A
解析 结构衔接题 。句子的前半句意思为“1945年以后，现代科技的建设性和创新性进一步显现出来”，而后半句说“这一过程当然也有问题”，所以，两部分的意思有冲突，需要一个引导让步状语从句的连词though或although来引导。需要注意的是，however和but也表示转折，但however后面需要加逗号分隔；而如果使用but，则句子的重心就转到了后半句，这与作者的原意不符。
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