Unfortunately, the cheap alternatives are even more harmful than the illicit drugs they replace.
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It is easier to win at chess if you are free, at your pleasure, to change the wholly arbitrary rules, but the fun is in winning within the rules.
汽油燃烧产物：()。
A. 一氧化碳、二氧化碳
B. 二氧化硫
C. 液化气
D. 天然气
He finds that students who were easy to teach, because they succeeded in putting what they
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