纵横交织的山脉,构成了我国地形的“骨架”。下列属于我国地势一、二阶梯分界线的是
A:太行山
B:秦岭
C:天山
D:昆仑山
下列各句中没有语病的一项是( )
—What are you going to do after the exams to Senior High School?
—I am going to _____________ for vacation.