| 完形填空。 | |||
| Villagers are much healthier than people who live in towns. One reason for this is country air is fresher than the air in smoky 1 . The villagers breathe fresh clean air all day in the fields, but the air the towns men 2 is always full of smoke and dust. We cannot live without air. If we are stopped from breathing 3 for five minutes, we will die. Bad air means bad health and certain kinds of 4 , which may kill us in the end, 5 they may not kill us at once. We all 6 what unpleasant feelings we get if we stay a long time in a closed, crowded room. After a time, we begin to feel very 7 . and can hardly keep our eyes open. The longer we stay, the worse we feel. How nice it is when we get 8 into the fresh air outside! We must keep our windows open, so that the 9 in our house is always fresh, and we should breathe as much as we can in the open air. For people who breathe 10 air for a long time often get very ill and die of lung diseases. | |||
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