——I feel so tired after a long walk.
——You had better have a ______.
A:talk
B:rest
C:swim
D:look
Another problem is if he can come at dawn.
下面为“某岛屿的示意图”,该岛约有280万人口,岛上主峰蓝山峰海拔为2256米。读图并结合所学知识,完成小题。