- 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：——我們城市的空氣質(zhì)量正在變得越來越糟糕。——是的。這些日子的PM2.5指數(shù)嚇人。我們必須采取措施減少空氣污染。A. reduce 減少；     B. remove 移動；    C. collect收集；  D. gather聚集；根據(jù)Air quality in our city is becoming worse and worse.可知空氣質(zhì)量越來越差，因此要減少空氣污染。故選A。
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