Looking back，we have reasons to believe that more prosperous and stronger China will surely make new contributions to civilization of mankind．
A. a；a
B. a；the
C. the；the
D. the；a
网友回答
A. a；a
(答案→)B. a；the
C. the；the
D. the；a
解析：回首过去，我们有理由相信一个更繁荣富强的中国将会为人类的文明做出新的贡献。第二空特指人类的文明。