It was cold. He_________ the collar to keep off the cold.[ ]

A. took up  

B. turned up  

C. went up  

D. got up

若某一保险标的由法律限定，但投保人可以自由选择保险人，则该保险方式属于（）。

A.普通保险

B.强制保险

C.自愿保险

D.商业保险