某种污染物的评价指数越高说明该污染物的含量越多。()
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山地地形可以在动力和热力上改变气流的输送规律和气象特征从而影响大气污染物的散布。()
What is the passage mainly about？
A. Ray Mathers and Eve Winick hold different opinions on tax.
B. People have different views and reasons about how taxes should be paid.
C. The progressive tax covers a percentage of people"s wages.
D. The flat rate taxes require everyone to pay the same percentage of their income.
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