单项选择题

Question 6 is based on the following news. At the end of the news item, you will be given 10 seconds to answer the question.
Now listen to the news.
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单项选择题
Martin Luther King, Jr. who delivered a famous speech named I Have a Dream was the leader of ______ in U.S.A.
A. Bus Boycott

B. the Progressive Movement
C. Civil Rights Movement

D. the Westward Movement
问答题
Economists are scratching their heads to explain the pork price jump. Some blame it on blue-ear, a contagious disease which may have killed 18,000 or 20m pigs, depending on whom you believe. Others say the main cause is the surge in global grain prices, which have increased the cost of feed for pigs. It is not only the Chinese who are paying more for their pork. Capital Economics, a London-based economics firm, points out that American pork prices have also jumped by more than 50% over the past year. Economists, however, may recall the old hog cycle that they learnt about in their first year of economics. This explains why prices in certain markets are subject to periodic booms and busts, because of a lag between the response in production to a change of price. Chinese pork prices today are not much higher than at their peak in 2004. High prices then prompted farmers to produce more, and prices fell sharply for two years. That in turn discouraged farmers from raising pigs. The inevitable result was today’s higher prices, which will probably lead to glut and failing prices tomorrow. Pigs may fly. But not forever.
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