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【单选题】
Why did people ask, 'how often can you do this?' in paragraph 4?A.
They wanted to know if they could attend the next festival.
B.
They were just curious.
C.
They liked it and looked forward to the next festival.
D.
They did not think that it should be held very often.
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举一反三
【简答题】自然土壤有机质主要来源是()。
【简答题】土壤有机质主要来源于（），但是各类土壤的差异很大。
【简答题】土壤有机质主要来源于 、 以及 等 。
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