How ___________ your sister going to get there? [ ]
A. are
B. be
C. is
答案：C
— Is that the art room?
— No, ___________ ___________[ ]
A. it isn't.
B. it doesn't.
C. it is.
白血病细胞增殖周期大致为（）
A.5天左右
B.7天左右
C.10天左右
D.15天左右
E.17天左右
