我国历史上唯一的一位女皇帝是 [ ]
A．慈禧太后
B．武则天
C．长孙皇后
D．萧太后
答案：B
I had just stepped out of the bathroom and was busily drying myself with a towel I heard the steps.[ ]
A．while
B．when
C．since
D．after
如图所示，刻度尺的分度值是______mm，铅笔的长度为______cm．
