德尔菲预测法
参考答案：
这种方法是聘请7—20位专家，由预测主持人与他们建立关系，不让专家之间相互知晓，避免专家间的相互影响。
----- I hear Tom got caught cheating in the final exam.
----- Yes. Little ________ that we were watching his every move.
A．realised he
B．he did realise
C．he realised
D．did he realise
设则当a=（）时，f(x)在x=0处连续。
则当a=（）时，f(x)在x=0处连续。