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

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、on the other hand
B、as a result
C、on the contrary
D、for instance
答案D
解析 本题考对上下文的关系的理解，作者以汽车、电力等具体例子论证段首句的观点，所以应该选for instance(例如)。其余选项：on the other hand另一方面；as a result结果是，因此；on the contrary相反。
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考研英语一

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