有滋阴补血、益精填髓功能的饮片是（）
A.生地黄
B.鲜地黄
C.熟地黄
D.生地黄炭
E.熟地黄炭
参考答案：C
已知集合A={x|2x2+7x-15＜0}，B={x|x2+ax+b≤0}，满足A∩B=φ，A∪B={x|-5＜x≤2}，求实数a，b的值．
I was about to tell him the secret _____ someone patted me on the shoulder.
A．as
B．until
C．while
D．when
