．We can never expect _________ bluer sky...

．We can never expect _________ bluer sky unless we create _________ less polluted world.

A．a；a B．a；the

C．the；a D．the；the

A 【解析】句意为：如果我们不创造一个环境污染减少的世界，我们永远不会期望拥有一个更蓝的天空。根据句意，a bluer sky和a less polluted world为可数名词表示泛指，所以用不定冠词。

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