We can have bluer sky if we create less polluted world.A. a. aB. a theC. the aD. the

问题补充：

We can have bluer sky if we create less polluted world.

A. a. a

B. a, the

C. the, a

D. the, the

答案：

(答案→)A. a. a

B. a, the

C. the, a

D. the, the

解析：两个都表示是泛指，故选A

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