5.The layer of soil that provides necessary nutrients for plant growth is called________.
A. litter
B. topsoil
C. humus
D. subsoil
[解析] 考查细节理解。根据文章第二段中的“The topsoil layer is made up of small particles of rock mixed with rotten plant...which is black and gives the topsoil its dark colour.This layer is usually rich in nutrients”可知给植物提供必要营养的土层是topsoil layer。
[答案] B
6.According to the text, which of the following is NOT true?
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.
[解析] 考查细节判断。根据文章第二段中的“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”可知,并不是土层深,它的颜色就深。
[答案] B
7.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
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