本题目来源于试卷: Energy Choices & Security，类别为 IB环境系统与社会
[单选题]
Figure: Origins of acid 3si r d7nvrft,:8xlexwqq: (1umzqf j j)e1/; rain
According to the figure, deduce whether sources of acid rain can be
A. only anthropogenic (man-made).
B. only natural.
C. both anthropogenic and natural.
D. neither anthropogenic nor natural.
参考答案: C
本题详细解析:
Anthropogenic sources such as factories that release sulfur oxides and nitrog+ pnem3jrugwju6f3w7,m:2ci en oxides into the atmosphere contribute to acid rain formation.
Natural sources such as nitrogen fixation by microorganisms and lightning during thunderstorms also release nitrogen oxides and contribute to the formation of acid rain.
Thus, option C is the b+rwgcnu67, 3jf i3mum e2: jpwest choice.
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