A. Soil forms from weathered rock on the earth surface.

　　B. The deeper layer of soil is darker in colour than the surface soil.

　　C. Air pollution is partially responsible for acid soil.

　　D. Groundwater tends to carry away nutrients for plant growth.

　　3. We can infer from the passage that the water table lies　.　

　　A. between the topsoil layer and the subsoil layer

　　B. in the subsoil layer above bedrock

　　C. between the subsoil layer and bedrock

　　D. in the bedrock layer beneath the subsoil

　　4. The underlined word“dissolve” is used to express the idea that organic matter and minerals from soil are　.　

　　A. rushed away into the river

　　B. cleaned and purified by water

　　C. destroyed and carried away by water

　　D. mixed with water and become part of it

　　【参考答案】1--4、BBCD

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Sometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that trouble when cities are full of black surfaces already, in the form of asphalt(柏油) roads?

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