术后贫血合并心功能不全的老年病人，输入以下何种血细胞制品最恰当（）。

A.浓缩红细胞

B.库存全血

C.去白细胞的红细胞

D.冰冻红细胞

E.洗涤红细胞

_____ it was very cold, _____ my friend still went swimming   in Jialing River this morning.             

A．Although;/

B．Although; but

C．But; although

D．/;although