下列哪一种药物是作用于M期的细胞周期时相特异药物。（）
A.卡氮芥
B.更生霉素
C.长春新碱
D.阿糖胞甙
E.羟基脲
参考答案：C
I ________ that you should be invited, but to my _______, they did without you.[ ]
A. planned; great surprise
B. intended; greatly surprise
C. planned; great surprise
D. intended; great surprise
能使木材、纸张变黑的酸的是 [ ]
A．浓硫酸
B．浓盐酸
C．稀硫酸
D．醋酸
