在直接销售渠道中，保险公司致力于与（）来建立联系。
A.保险代理人
B.保险经纪人
C.准保户
D.保险营销人员
参考答案：C
Do you have any idea it takes to successfully reach the top of Mount Everest?
A．whether
B．how
C．which
D．what
(2013·皖南八校一模)I felt surprised that anyone of his intelligence ________ such an easy test.
A．might have failed
B．could have failed
C．should have failed
D．must have failed
