单项选择题 设y=x99，则y(100)=( )． A．0 B．99! C．100! D．1

未知题型 在新形势下，电信企业的业务范围拓展，出现了内容采购、服务外包方面的要求，这使得电信企业运营必须重视( )。

单项选择题 It is quite probable that you could not find the model ______ which you were looking ______ our catalogue. A．in, for B．for, in C．after, in D．in, after