题目内容
Whether ________ or professional, American football is perhaps the most popular sport in the US. It attracts a total attendance of over 40 million and is watched by many more millions on television each year.
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The new system designed to ________ harmful emissions (排放物) from factories will be put into use soon.
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People are beginning to realize that to ______ nature at will is the biggest mistake that man has ever made.
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