已知0<a<1,化简a+1a+2-a+1a-2=____
Last week I met my old friend Li Ming by accident but I forgot _______ him for his telephone number.
读非洲气候分布图,图例中A种气候类型主要分布在刚果盆地和几内亚湾沿岸,这种气候类型是