D．The campaign can be easily developed in cities.

　　【答案与解析】　D　细节题。根据第4部分看“城市是改革的中心，在那里行动很容易发生”，由此判断，在城市里“运动能很容易展开”。

　　46．Which of the following is NOT the cause of greenhouse effect?

　　A．The water vapor in the air.

　　B．Gases like methane and ozone.

　　C．The heat people have produced.

　　D．The out space.【答案与解析】　D　细节题。根据第3部分看，外层空间不是引起温室效应的原因。

　　47.We can conclude from the passage ________.A．climate change is mainly caused by people in cities

　　B．the increase of population is the main cause of pollution

　　C．human activity is one of the most important causes of pollution

　　D．air pollution is the greatest pollution in our modern world【答案与解析】　C　推断题。城市是能源消耗大户，在气候改变方面起重要作用。而能源消耗的主体是人，所以“人类活动是导致污染的重要原因之一”。

　　D

　　The discovery of two large pieces of the Titanic's hull (残骸) on the ocean floor indicates the fabled luxury liner (豪华客轮) sank faster than previously thought, researchers said Monday.

　　The hull pieces were a crucial (主要) part of the ship's structure and make up a bottom section of the vessel missing when the wreck was first located in 1985, the researchers said.After the bottom section of the hull broke free, the bow and stern (船尾) split, said Roger Long, a naval architect who analyzed the find.The stern, which was still buoyant and filled with survivors, likely plungged toward the North Atlantic floor about five minutes later. “It turns out the Titanic was more merciful. It was over more quickly，” Brown said.

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