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土层（soil horizon）
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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 t}le surface soil．C．Air pollution is partially responsible for acid soil．D．Groundwater tends to carry away nutrients for plant growth．
考题
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.
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单选题Why does land become desert after all trees are cut down?A
Because nothing remains on land except floods.B
Because there are no longer trees to keep the rain and protect the top-soil.C
Because too much rain sinks in and washes away the top-soil.D
Because roots of the trees break up the soil.
考题
单选题A
To transport water to high places.B
To provide air conditioning.C
To fertilize the soil.D
To adjust the soil temperature.
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