It seems that living green is easy and cheap. A small step can be rewarded with long-term

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(答案→)A. astonishingly
B. exactly
C. fortunately
D. hardly
解析：本题考查副词辨析。从“A small step makes a big difference.”中的“small”与“big”可以理解到“这是惊人的容易和做得到的”。exactly“确切地”，fortunately“幸运地”， astonishingly “惊人地，让人意外地，吃惊地”，hardly“几乎不”。