From the text, we know that the Great Lakes Which of the following shows that water quality has improved?

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问题 From the text, we know that the Great Lakes
Which of the following shows that water quality has improved?

选项 A、Fish and birds show residues of heavy metal.
B、Toronto has grown salmon successfully in its waters.
C、Farming has prospered in the lakeside areas.
D、Lake water has been drawn for use by the population.

答案B

解析 题干问的是下列哪种情况表明水质的提高。文章的第二段结尾处谈到了清理湖水之后的结果:"对于鱼和鸟的检测发现,重金属的残余量降低(虽然汞含量还比较危险),与此同时,在过去的10年中,多伦多附近的河水能够成功的养殖鲑鱼",因此为正确答案。
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