(1.5 分)Occlusion occurs when .
A.the cold front catches the warm front B.the warm front catches the cold front C.the cold front departs from the warm front D.the warm front departs the cold front正确答案A
(1.5 分)Occlusion occurs when .
A.the cold front catches the warm front B.the warm front catches the cold front C.the cold front departs from the warm front D.the warm front departs the cold front正确答案A
