第290课:What is the biggest environmental problem in the world

每天一个生活口语话题，一段地道的举例回答，并附有详细的词汇，发音及用法讲解。讲解材料选自当今最先进最有效的英语原版教材，更加贴近生活。每天坚持听讲解，并根据问题练习，给自己一个地道输入和输出的机会，你也可以张口自信说英语。

主题：What is the biggest environmental problem in your country?

Coming from the United States of America, I'd have to say that at this point my country's worst environmental problem would have to be the attitude of the people. The environment didn't get this way on it's own, and for changes to happen, the mindsets of man have to change first. Until then, nothing better's gonna happen.

Mindset: 心态