.We can never expect bluer sky unless we create less polluted world.
A. a;a
B. a;the
C. the;a
D. the;the
网友回答
(答案→)A. a;a
B. a;the
C. the;a
D. the;the
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。