题目内容
Consequently, more than 100 cities in the United States still have levels of carbon monoxide, particulate matter, and ozone that（）legally established limits.
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Your speech class will give you an opportunity to gain confidence and make your nervousness work for you（）against you.
They do this by doing well-informed about their subjects, being honest in what they say, by using sound evidence, and by employing（）reasoning.
未受或者尽量少受人类活动，特别是人为污染影响的土壤化学元素的自然含量称为（）。
Vehicles（）only the simplest of the engine improvements that methanol makes feasible would still contribute to an immediate lessening of urban air pollution.
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