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— Air quality in our city is becoming worse and worse.
—Yes. These days' PM2.5 readings are frightening. We must do something to ______air pollution.
A.reduceB.removeC.collectD.gather
A

试题分析:句意:--我们的城市的空气质量越来越差。--是的,这些天的PM值是2.5真让人害怕。我们必须采取措施来减少空气污染。A. reduce减少; B. remove移动; C. collect收集; D. gather收集。
结合所给选项,故选A。
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