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

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