A:He is black
B:As he is black
C:Bing black
D:For he is black
—I think my Maths teacher is working hard. He teaches us very .
—Yes, but he can't come today. He doesn't feel .
“百里不同风,千里不同俗,”世界各国***相径庭。如伸小指,在我国表示微不足道、拙劣;在印度、缅甸表示想去厕所;在美国表示打赌;在泰国表示友好。这说明 ( )