live. Bad air makes people ill. We must have.\rfresh air to keep us healthy.\rIn the city there are a great many people and there are too many\rcars running on the roads. The gas which the cars spread out is\rfull of poison. Every day we breathe it in and out. Besides so many\rcars, there are many factories too. From the chimneys of these\rfactories, we get the smoke usually in a black or grey color. This\rkind of smoke, when it mixes with the airz is dangerous to our health.\rIt is because smoke contains many small poisonous soils and gases .\rSo in order to keep healthy we have to go out the countryside to\rbreathe more fresh are. O r . we can go up hills to get more fresh\rair.
全文预览
