摘要：Hundreds of years ago, life was 1 than 2 today. People didn’t have modern machines. There 3 modern medicine, 4 . Life today 5 new problems. One of the biggest is pollution . Water pollution has 6 our rivers and lakes dirty. It kills our fish and affects our drinking water. Noise pollution makes us 7 louder and 8 . Air pollution is the most serious kind of pollution. It affects 9 living thing in the world. Cars, planes and factories all pollute our air every day. Sometimes the pollution is so 10 that it is like a quilt over a city. This kind of quilt is called smog. 1. A.more hard B.more harder C.much harder D.much more harder

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