We can never expect _______ bluer sky unless we create_______less polluted world.

A. a; a B. a; the　　　　　　　　　　　 C. the; a D. the; the

解析：選A。考查冠詞。句意：我們不會(huì)擁有更藍(lán)的天空，除非我們建立一個(gè)污染更少的世界。a bluer sky 更加蔚藍(lán)的天空；a less polluted world 一個(gè)污染更少的世界。

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