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图中所列国家为SCI的前十名，我国排名：
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舍伍德(Sherwood)算法是一种常用的(57)算法。
2010年2月6日，()高速铁路正式投入运营。这是中国中西部第一条高速铁路。这条高铁全长505公里，列车运行时速350公里。两地直达最短时间由6个多小时缩短至2小时以内。
SECTION B PASSAGES
Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
听力原文： It may be true, and we have to recognize obviously, that the population is badly housed and that we need more housing. However, housing uses up our scarce resources. It is pretty meaningless, therefore, to talk about providing more housing without taking into account the alternative use of resources. To provide more housing, when you have scarce resources, also implies, perhaps, making a choice between housing and other things which we could provide. Now, therefore, it's a question of priority. This is the problem which is true in U.K. market and it's also true in any housing market. The decision to provide more housing would involve giving up something. The question, therefore, arises. To what extent is the housing the greater priority than, say, health care and education so we come to the problem about choice. How are choices to be made in any economy, concerning how much housing is going to be provided？ Indeed, how are the choices going to be made in any economy about anything which is provided？.., and who is going to make that choice？ Basically, choices about how resources are allocated in any economy boil down to two possible ways of solving this problem. You either have the choices made directly by the government, or, the choices are made indirectly through the market.
What is the general topic of the lecture？
经纪机构提供中介服务,是以()为目的,通过佣金方式取得其劳动服务的报酬。
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