1. polluted Noise 2. 有时被污染的空气如此的厚,就像城市上晌迅轿空盖了一条被昌唤子. 3. If there are fewer people driving. / If fewer people drive cars, there will be less pollution. 或 宴肆 The fewer people drive, the less pollution there will be. 4. Factories must now clean their water before it is thrown away. 5. Life today has brought new problems. 答案不唯一 |