西北地区气候干旱的主要原因是( )
A:距海较远
B:温度较高
C:纬度较高
D:海拔较高
爸爸花180元钱给我买了一套服装,上衣的价钱是裤子的2倍,上衣和裤子各花了多少钱?
已知等差数列{an}的前n项和为Sn,且a1=1,S3=0.
I am Lily. I like Music and PE very much. But I don't like Maths. Lucy is my friend. She likes Maths and Music very much. But she doesn't like PE. We love to dance and sing after class. We are good friends.