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  3. The Great Lakes between the US and Canada are the largest bodies of fresh water in the world. For a long time, people lived happ

The Great Lakes between the US and Canada are the largest bodies of fresh water in the world. For a long time, people lived happ

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问题   The Great Lakes between the US and Canada are the largest bodies of fresh water in the world. For a long time, people lived happily beside the Lakes until the countries began to build factories along the shores. Pollution was killing the Lakes; pretty soon, the Lakes’ ecosystem was not right any more. Scientists knew something had to be done. So did the government. They learnt it was important to keep the ecosystem of the Lakes healthy and strong. If the Lakes dried up, the whole world would feel it. Many areas would become deserts and many animals would lose their homes and maybe die out. As a result, they set up a lab called the Great Lakes Environmental Research Laboratory to solve the problem.  
Pollution didn’t have much effect on the ecosystem.
选项 A、Right.
B、Wrong.
C、Doesn’t say.
答案B
解析 根据第一段第三句可知污染已经破坏了生态平衡，所以答案为B。
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