听下面一段材料,回答第1至4题。 |
1. What's the passage mainly about? |
A. Air pollution outside. B. Indoor air pollution. C. The disease caused by the polluted air. |
2. Where did some of the worst indoor air pollution happen? |
A. In most developing countries. B. In a few developed countries. C. In developing countries where people used wood and coal to cook. |
3. How many diseases could be caused by breath in harmful indoor air according to the passage? |
A. 5. B. 6. C. 7. |
4. What would be probably talked about next? |
A. Problems of indoor air pollution. B. Causes of indoor air pollution. C. Ways to solve the problem of indoor air pollution. |