“十一五”期间，我国将要使公路总里程达到( )万km。
A．200万kmB．220万kmC．230万kmD．250万km
参考答案：C
血液中各种有形成分和凝血因子在ACD保存液中保存期各为多久
-What do you do yesterday afternoon?
-I went to the bookstore，___ some books and visited my uncle.
A．to buy
B．bought
C．Buy
D．buying
