—May I study English you, Jane ?
—No problem. [ ]
A. in
B. about
C. with
答案:C
当x=3,y=5时,5y-2x2的值是( )
A.7
B.18
C.13
D.17
面前静脉是面部的主要静脉,它先汇入
A.面总静脉B.面后静脉C.颈内静脉D.锁骨下静脉E.颈外静脉