More and more people have a low-C life and the air is than before.A. goodB. more goodC. b

问题补充：

More and more people have a low-C life and the air is than before.

A. good

B. more good

C. better

D. the best

答案：

A. good

B. more good

(答案→)C. better

D. the best

解析：整句理解：越来越多的人过低碳生活，低碳后的空气质量应当比以前更好，所以用good的比较级better，所以选C。