1. Modern science has proven that acid rain (酸雨) is a dangerous problem. As a result, various ways to __1__ acid rain have been invented, and some are now __2__ used. But __3__ some cases, industries have tried curb acid rain production. There are many ways that power plant companies can reduce acid rain __4__. They can use coal with a sulfur (硫) content, and they can control process known to generate __5__ levels of acid rain.
1).
A. limit
B. high
C. creation
E. in
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