Some people fear that air pollution may bring about changes in weather around the world.
A. /; the
B. the; /
C. an; the
D. the; a
网友回答
A. /; the
B. the; /
C. an; the
D. the; a
解析： Air pollution 是抽象名词这里是泛指，weather 这里是特指全球的气候，根据the weather around the world 可知。