--- People should spare no efforts to protect the environment.
--- . Air pollution does harm to our health.
A. All right
B. Take it easy
C. Go ahead
D. Exactly
网友回答
A. All right
B. Take it easy
C. Go ahead
(答案→)D. Exactly
解析：考查交际用语：A. All right好啊，行啊，B. Take it easy放轻松，C. Go ahead请便，D. Exactly 确实，句意：--人们应该不遗余力的保护自然，--确实，空气污染对健康有害。选D。