Question
What scientific topics will be covered in the textbook this year?
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| Column A | Column B | ||
| (a) | Sulphur dioxide | (i) | Damage ozone layer. |
| (b) | Carbon dioxide | (ii) | Reduces oxygencarrying capacity of blood. |
| (c) | Carbon monoxide | (iii) | Acid rain. |
| (d) | Chlorofluorocarbons | (iv) | Green house gas. |