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土壤结构（soil structure）
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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．
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M．Jackson suggested the data structure oriented software design method．Which of the following structure can be introduced by using input data structure?A．algorithm structureB．procedure structureC．code structureD．program structure
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_____ a spoonful of soil can tell us so much about the structure and early history of the moon.
A、RemarkableB、Quite remarkablyC、It is remarkable thatD、It is remarkable fact that
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.
考题
单选题Why does the author call lichens pioneers?A
Because they developed so early in the history of the planet.B
Because of their primitive structure.C
Because they prepare soil for other plants.D
Because they were the first plants to live in Antarctica.
考题
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 data manipulation language statement （）.A
completes a transaction on a tableB
modifies the structure and data in a tableC
modifies the data but not the structure of a tableD
modifies the structure but not the data of a table
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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