尺牍
参考答案:
一尺牍多用于写信,所以书信古称“尺牍”。
不等式(x2-2x-3)(x2+1)<0的解集为( )
A.{x|-1<x<3}
B.{x|x<-1或x>3}
C.{x|0<x<3}
D.{x|-1<x<0}
I thought we'd be late for the concert, _____ we ended up getting there ahead of time. [ ]
A. but
B. or
C. so
D. for