读下图,下列说法正确的是( )①甲图山脉为中国地势第二、第三级阶梯的分界线②乙图山脉为中国季风区与非季风区的分界线③丙图山脉为中国南方地区与北方地区的分界线④丁图山脉为中国水田农业与旱地农业的分界线 A . ①② B . ①④ C . ②③ D . ②④ 答案:D8、---What is the head teacher like, do you know?
---She is very kind __________ she
looks very serious.
A.because B.so
C.though D.or