Many years, life was【C1】______than it is today. People didn’t have modem mach

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问题 Many years, life was【C1】______than it is today. People didn’t have modem machines. There was no modem medicine,【C2】______.
Life today has brought new problems. One of the biggest is pollution( 污染 ). Water pollution has【C3】______our rivers and lakes dirty. It kills fish and affects( 影响 )our drinking water. Noise pollution makes us talk louder and【C4】______. Air pollution is the most serious kind of pollution. It affects【C5】______living thing in the world.
Cars, planes and factories all pollute our air every day.
Many countries are making laws(法律)to stop pollution. Factories, must from now on, clean their water【C6】______away, they mustn’t sent out dirty smoke into the air.
We need to do many other things. We should put waste things in the dustbin(垃圾箱)【C7】______throwing them on the ground. We can go to work by bus【C8】______with our friends in the same car. If【C9】______people driving, there will be【C10】______pollution. [br] 【C6】

选项 A、before it is thrown
B、after it is thrown
C、until it is thrown

答案 A

解析根据句意“许多国家制定法律用来阻止污染，从现在开始，一些工厂在排除污水之前，必须对它们进行有效的清除”。

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