In the geography class, the teacher explained wind and water might cause soil ____________.
（A）pollution
（B）excellence
（C）explosion
（D）erosion
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更多大学英语选择题200道试题
- 1I was surprised to see the little girl play the piano so skillfully; she must have a(n) ___________ future in music.
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- 3She invited 500 people __________ her beautiful ship.
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