C. Crops can ′t take in the heat lf there is greenhouse effect

　　D. Although greenhouse effect is necessary．Too much of it will cause us to die.

　　50. What will the author most probably discuss in the paragraph that follows?

　　A. What kids can do to help stop global warming.

　　B. Who should be responsible for the environmental problems.

　　C. What global warming is doing to the environment.

　　D. Why cars and buses pollute the air a lot

　　【参考答案】46—50、ABCDA

　　较难题目特训：科普知识类

　　Have you ever noticed the colour of the water in a river or stream after a heavy rainfall?What do you think caused this change in colour?It is soil that has been washed into the river from the riverbank or from the nearby fields. Components of Soil

　　Soil is made up of a number of layers(层),each having its own distinctive colour and texture. The upper layer is know as the litter. It acts like a blanket,limiting temperature changes and reducing water loss. The topsoil layer is made up of small particles of rock mixed with rotten plant and animal matter called humus(腐殖质),which is black and gives the topsoil its dark colour. This layer is usually rich in nutrients,oxygen,and water. Below the topsoil is the subsoil,a layer that contains more stones mixed with only small amounts of organic matter. This layer is lighter in colour because of the lack of humus. Beneath the soil lies a layer of bedrock.

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