— .
A:By car
B:For half an hour
C:Terrible
D:Three kilometers
— Do you know ________?
— Yes, I do. He went by skateboarding!
我国北方地区、南方地区在自然、人文等方面均有较大差异。据此回答下题。
已知集合A={﹣1,0},集合B={0,1,x+2},且A⊆B,则实数x的值为____