Pollution has a bad effect on our health. The government is taking action to change the terrible .

A. education B. situation C. background D. temperature

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Dear Mary，

I’m sorry to hear that you didn’t get good grades in math mid-term exam. And you said you spend a lot of time studying math. However， it is difficult for you to learn it well. I think you should find a right way to learn it. Here is my advice for you.

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