问题描述：
[单选]
刚收获的小麦堆放在一起，过一段时间后将手插入时会感到发热，这主要是因为（）A．小麦蒸腾作用释放了热量B．小麦光合作用释放的热量C．小麦呼吸作用释放的热量D．小麦中的有机物被细菌、真菌分解释放了热量
A．A
B．B
C．C
D．D
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答案解析：无
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