不用测量也不利用网络信息，只按某种固定规则进行路由选择的算法是________。
参考答案：静态路由选择算法
―She didn’t come to school yesterday, ?
― , though she was not feeling well.[ ]
A. did she; Yes, she did
B. did she; No, she didn’t
C. didn’t she; Yes, she did
D. didn’t she; No, she didn’t
人类在距今约多少年前形成 [ ]
A．一百万年
B．二百万年
C．五六百万年
D．三四百万年
