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        1. ______ can cause high blood pressure and hearing problems.
          A.Air pollutionB.Water pollutionC.Light pollutionD.Noise pollution
          D
          句意“......能引起高血壓和聽力問題。”,A“空氣污染”;B“水污染”;C“光污染”;D“噪音污染”。根據(jù)句意可知,答案選D。
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