既是我国地势阶梯分界线,又是东北—西南走向,且西部是高原、东部是平原的一组山脉是( )
A:昆仑山、祁连山
B:巫山、雪峰山
C:长白山、武夷山
D:大兴安岭、太行山
I ______ have worried before I came to the new school, for my classmates here are very friendly to me.
下列正确的是( )