Who says man is alone in trying to ______the problem of air pollution? There are certain moths(蛾) wh

Who says man is alone in trying to ______the problem of air pollution? There are certain moths(蛾) whose color serves to protect them.

A.solve

B.settle

C.have

D.meet

答案及解析： A

解析：

issue 解决争端、争论、问题等。