经线指示南北方向,这样在北极点有( )
A:一个方向
B:两个方向
C:三个方向
D:四个方向
“海带炖排骨”和“紫菜蛋汤”是人们喜爱的佳肴,你知道海带和紫菜属于以下哪类生物吗?( )
-Jeff seems unhappy. What's the matter?
-He got his bike lost this afternoon. Let's go to __________ him __________.