听下面一段独白，回答以下小题。1.
2.
3.
| A．Harmful substances in the smoke from homes. |
| B．Damp chemical gases from factory chimneys. |
| C．Smoke from homes mixed with dust in the air. |
| D．Mixture of fog, smoke and other waste gases. |
| A．Harmful gases rise and fall between layers of cold and warm air. |
| B．Smoke and chemical gases build up under a layer of warm air. |
| C．Smoke and waste gases remain near the ground as cold air pours in. |
| D．Thick smoke and gases blown by the wind pile up above warm air. |
| A．Temperature inversion. | B．Solar radiation. |
| C．Automobile exhausts. | D．Foggy weather. |
更新时间：2024/05/03 07:50:13
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