Beijing put forward the slogan of "High-tech Olympics, People's Olympics and Green Olympics" when bidding for the 2008 Olympic Games. In order to make the 2008 Beijing Olympic Games green,

A, industrial "three wastes" can only be discharged after treatment, but chemical enterprises can't be closed, which is in line with the meaning of the question. Therefore, option A is correct;

B, coal, oil and other fuels combustion produces harmful gases such as sulfur dioxide, which can be replaced by natural gas, which does not meet the meaning of the question. Therefore, option b is wrong;

C, improve the sewage treatment rate is correct, does not conform to the meaning of the question. Therefore, option c is wrong;

D, reducing vehicle exhaust pollution is correct and does not meet the meaning of the question. Therefore, the d option is wrong;

So choose: a.

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