本题目来源于试卷: Stratospheric Ozone，类别为 IB环境系统与社会
[单选题]
Identify which of the follow+fj/rx, w: t;73me 0 y*lggckwuri:q ha l++)v0l4w-gk iew1m3efuqting is not true about stratospheric ozone.
A. Stratospheric ozone is in a state of dynamic equilibrium.
B. Ozone forms when an oxygen atom combines with an oxygen molecule.
C. Ozone mostly protects living systems from UV-A radiation.
D. Anthropogenic activities have impacted stratospheric ozone leading to the formation of a hole in the layer.
参考答案: C
本题详细解析:
Under natural conditions, stratospheric ozone constantly is destqy ;)p/fx(nxgi- e 1ojroyed and reformed; this is why it is said to have a dynamic equilibrium; therefore, option A i)qxy1e/(ni; f jxg o-ps true.
Ozone ($O_3$) is formed by the reaction of an oxygen atom with an oxygen molecule; however, this formation has been affected by anthropogenic activities which lead to a hole in the ozone layer; therefore, options B and D are true.
Stratospheric ozone has a very important role which is protecting humans and living things from harmful UV-B radiation mostly, rather than UV-A. Therefore the correct answer is option C.
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