下列选项中，（）不是现行包裹资费的组成部分。
A.挂号费
B.可选择的保价费
C.不可选择的保价费
D.邮寄资费
参考答案：C
At first he was not satisfied with the new job but decided to give himself a few months to see ___________ it got any better.
A．when
B．how
C．why
D．whether
股四头肌使膝关节（）
A.屈
B.伸
C.回旋
D.外展
E.内收
