We can never expect bluer sky unless we stop industrial waste going into atmosphere.
A. a; the; the
B. the; the; the
C. a; /; the
D. the; /; /
网友回答
(答案→)A. a; the; the
B. the; the; the
C. a; /; the
D. the; /; /
解析:a blue sky 蔚蓝的天空,固定搭配。第二空特指工业的废物故加the ,第三空atmosphere 大气层前面加the.句意:除非我们阻止工业废物排放到大气层中,否则我们不可能期望有蔚蓝的天空。