本题目来源于试卷: Stratospheric Ozone，类别为 IB环境系统与社会
[单选题]
Describe ozone-deple5yckg* ; 4cg u iv;)qewr12kbpr5f/ktd 0xes0ting substances (ODS) and their effects.
I.
Ozone-depleting substances include halogenated gases like CFCs, used as propellants in aerosols and coolants for refrigerators.
II.
The ODS reach the stratosphere and release the halogens they carry. This disrupts the normal equilibrium of ozone formation and destruction, causing a decline in ozone.
III.
The stratosphere can no longer absorb enough of the UV radiation, causing the rays to reach the surface of the Earth, harming the organisms, causing eye problems and skin cancer.
A. I and II only
B. I and III only
C. I, II and III only
D. III only
参考答案: C
本题详细解析:
All the statements (I, II and III) describe ozone-depleting substabyr6/2 ,p*yxuglo. d.gy +liknces and their effects. ODS include C*yi lox26,d .u/yp+ly gr gbk.FCs and HCFCs, propellants and coolants in refrigerators, air conditioners, and fire extinguishers (Statement I) Ozone ($O_3$ ) + Cl → $O_2$+ ClO ClO+O→$O_2$+ ClO One atom of Cl can go through several reactions disrupting the equilibrium of ozone formation and destruction (Statement II). The ozone hole caused due to the decline in stratospheric ozone allows harmful UV radiation to reach the Earth’s surface (Statement III).
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