单项选择题

案例分析题

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 100miles,the V-2rocket【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 1945the constructive and creative opportunities of modern technology could be exploited,【C20】______the process has not been without its problems.

【C1】()

A.observed
B.notified
C.commented
D.detected

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单项选择题 Computers in the United States() .

单项选择题 听力原文: I spoke yesterday about the construction of ancient Viking ships. Today I'd like to discuss the transocean voyages that the Norse made in these open boats-voyages made without compasses or charts. Somehow the Vikings managed to get across the North Atlantic and back home again. Although the shortest distance between the coast of Norway and Green- land is about 900 miles, the Vikings preferred to take a longer route south of Iceland and there-by avoid pack-ice. This was a voyage of well over one thousand miles. How did Norse sailors find land after days of sailing out of sight of land? well, experienced sailors used the relative position of the stars to help them navigate. The sun's position could also be noted, but it moves across the sky and its position alters a little every day, so it was not easy for the Vikings to use. However, even when out of sight of land, an experienced sailor could find in- formation. As there are landmarks on land, so there are at sea. Whales gathered in large numbers to feed at an area half a day's sail south of Iceland. Migrating birds on their annual flight were also helpful because they always followed the same route. So, geese flying between Britain and Iceland were of particular use to the Vikings. One Icelander also took ravens with him, releasing them until one day they didn't return. He followed their direction and found land. In 900 A. D, ingenuity had to take the place of technology.What is the main topic of the talk?A.Life in Norway during Viking(海盗)times.B.Different ocean routes taken by the Vikings.C.Methods used in Viking navigation.D.The importance of migrating geese in Viking navigation.