【题目】People are concerned about the air quality they _____________.
A.breathB.breatheC.breakD.bother
在线课程【答案】B
【解析】
考查动词词义辨析。句意：人们关心他们呼吸的空气质量。A. breath 名词，呼吸；B. breathe呼吸；C. break打破；D. bother烦扰。根据上文the air quality可知是指“呼吸的空气质量”，故排除C、D选项；且此处主语为they，句子缺少谓语动词，故选B。