本题目来源于试卷: Acid Deposition，类别为 IB环境系统与社会
[单选题]
Figure: Origins of ac ,r5 v-kg0xb ta4crq8gid : sjrcggf(.1k)xt2b rrain
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 an6f4z)j9qr llsd nitrogen oxides into the atmosphere contribute to acid rain formation.
Natural sources such as nitrogen fixation by microorganisms and lightning during thunderstorms also release nitrogen ol)9r fzq46jslxides and contribute to the formation of acid rain.
Thus, option C is the best choice.
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