— 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

試題分析:句意:--我們的城市的空氣質(zhì)量越來越差。--是的,這些天的PM值是2.5真讓人害怕。我們必須采取措施來減少空氣污染。A. reduce減少; B. remove移動; C. collect收集; D. gather收集。
結(jié)合所給選項,故選A。
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