2009年6月英语六级考试听力成功指南(第十六期)

　　Questions 16 to 19 are based on the talk in class about United States history.

　　16. What is the main topic of the talk?

　　17. According to the professor, what was the major change in agriculture during the 19th century?

　　18. According to the professor, what was one result of the increased use of machinery on farms in the United States?

　　19. According to the professor, why was world market important for the United States agriculture?

　　Passage 6

　　The energy which the sun radiates goes in every direction. However, only a minute part of it falls on the earth. Even so, it represents the power of about five million horsepower per square mile per day. The sun gives us as much energy every minute as mankind uses in a year. At present, we use this energy indirectly, and it is our only final source of power. Coal represents the chemical action of the sun on green plants thousands of years ago. Water power results from the sun's creation vapor and the resulting rain. Even windmills operate because of air currents set in motion by the uneven heating effects of the sun in different places, Already, a scientist has worked out an engine, surprisingly efficient. This engine uses a series of mirrors which concentrate the sun's energy on a tube of water to create seam.

　　Questions 20 to 22 are based on the passage you've just heard.

　　20. What does this passage tell us about?

　　21. How much energy does the sun give to the earth in a minute?

　　22. How do people use solar energy at present?

　　题解：

　　Passage 5

　　这是老师在课堂授课的讲稿。文章介绍了19世纪美国农民如何从自给自足到依赖他人的演变过程。分析了造成这一变化的原因。

　　听时要注意按照时间顺序理清农民的特点及原因。

　　16.D 这是一道主旨题。把握时间的顺序，如at the beginning of the 19th century, but by the mid century, by late in the century便可知。文章的最后一句话也说明了这层意思。

　　17.A 这是一道细节题。从"revolutionary advances ... has vastly increased production of specialized crops .... "可知。

　　18.B 这是一道细节题。从"Now farmers were no longer dependent ..., their lives were increasing controlled by banks, which had powder to grant or deny loans for new machinery."可知。