I can still vividly remember to pick our steps in the mountain down the deep valley on my 21st birthday.

A．picking ... in the mountains

B．picking ... on the mountain

C．having picked ... from the mountains

D．picking ... from the mountains

产品责任保险的保险费是一种预收保费，在保险期满时再进行调整，多退少补。影响保险人实收保费的因素共有（）等。

A.产量或销售人员总额

B.上年生产、销售总额

C.上年的营业收入总额

D.上年的利润总额

E.规定的保险费率