It seems that living green is easy and affordable. A small step masks a big difference.A.

问题补充：

It seems that living green is easy and affordable. A small step masks a big difference.

A. exactly

B. fortunately

C. surprisingly

D. hardly

答案：

A. exactly

B. fortunately

(答案→)C. surprisingly

D. hardly

解析：考查副词。exactly：准确地；fortunately：幸运地；surprisingly：惊讶地，出乎意料地；hardly：几乎不。题干意思是：似乎保护环境是出乎意料的简单可行，小小的行动能带来很大的不同。选C。