冰冻红细胞的红细胞回收率为（）。

A.95%

B.90%

C.80%

D.70%

E.60%

根据中文提示写出单词或词组，按适当形式填空。

小题1:The place has rapidly __________(发展) from a small village to a famous place of interest.

小题2:We couldn’t go home ___________(除非) we cleaned the classroom.

小题3:It’s ________( 可能的) that we gave him the wrong information.

小题4:The air was so cold that we could hardly ___________.(呼吸)

小题5:He had to ____________( 帮助养活) his family when he was a child.