题干
PM 2.5 does harm to people's health and the environment.（保持句意基本不变）
PM 2.5 is ____ ____ people's health and the environment.
答案(点此获取答案解析）
bad,for
PM 2.5 does harm to people's health and the environment.（保持句意基本不变）
PM 2.5 is ____ ____ people's health and the environment.
