若二次函数y=x2+2x-7的函数值是8,则对应的x 的值是 [ ]
A.3
B.4
C.5 或-3
D.3 或-5
D
Don't leave matches or cigarettes on the table within the _____ of little children.
[ ]
A. hand
B. reach
C. space
D. distance
下列治疗肿瘤的药物中,哪一种是细胞周期非特异性药物()
A.三苯氧胺
B.氮芥
C.阿糖胞苷
D.长春新碱
E.甲羟孕酮