流经西双版纳的著名河流是[ ]
A、怒江
B、金沙江
C、澜沧江
D、雅鲁藏布江
答案：C
Show ____________ your ruler.[ ]
A. I
B. me
C. you
I was about to leave my house______ the telephone rang.
A．while
B．as
C．when
D．and
