经典途径的C3转化酶是（）。

A.C4b2a

B.C3bBbP

C.C5a

D.C4b

E.C5b6789n

根据句意和首字母提示写单词完成句子。（10分）。

小题1:Can you u_________ what I said

小题2:When you make some mistakes, you should c_________ them.

小题3:How about r_______ English in the morning?

小题4:It’s d_________ to remember new words.

小题5:My mother is b_______ washing clothes.

小题6:There are lost of old________（教堂）in the city.

小题7:our listening is not very good.You need a lot of p________.

小题8:Sam h________ his foot when he was playing basketball yesterday.

小题9:The price of this shirt is very l________.I will buy it.

小题10:Is it p________ to finish the work in a week?