Global warming is a big for all and it’s important to raise awareness about climate chang

问题补充：

Global warming is a big for all and it’s important to raise awareness about climate change.

A. reward

B. concern

C. evolution

D. boom

答案：

A. reward

(答案→)B. concern

C. evolution

D. boom

解析：句意，全球变暖关系全人类，提升关于气候变化的意识很重要。Reward 报酬 concern关系 evolution 进化 boom 繁荣，根据题意，故选B。