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单选题
All of the following are mentioned as sources of energy of rural agricultural societies EXCEPT ______.
A
firewood
B
dung cake
C
solar power
D
agricultural waste
参考答案
参考解析
解析：
关于乡村农业社会的能源，文章开头便指出在一些乡村的农业社会中，对可利用能源的收集，如柴火（firewood）、牛粪饼（dung cake）和农业废弃物（agricultural waste）每年都要花费200到300人日（person-day“人日”，是统计学方面的一个时间单位，指一个普通人正常活动的一日）。可见只有太阳能不包括在内，因此选C。
关于乡村农业社会的能源，文章开头便指出在一些乡村的农业社会中，对可利用能源的收集，如柴火（firewood）、牛粪饼（dung cake）和农业废弃物（agricultural waste）每年都要花费200到300人日（person-day“人日”，是统计学方面的一个时间单位，指一个普通人正常活动的一日）。可见只有太阳能不包括在内，因此选C。
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