[ Preposition ]
– In mauy areas, the overuse of land results ……….. the erosion of topsoil. This soil erosion, ………. turn, causes the over-silting or sedimentation of rivers and streams.
A. from/at
B. with/on
C. in/in
D. about/for

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A. will reduce
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the nicest and highest quality way, better than average
A. rigorous
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A. watched
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You _____ haven’t bought me a birthday present.
A. Just
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