等温线密集的地方( )
A:气温变化不大
B:气温变化大
C:气温低
D:气温高
习惯上划分东西半球的分界线是( )
Miho is student because she was born later than anyone else in her class.
要实现黄土高原社会、经济可持续发展,关键是( )