患者，男，42岁。小便频数，夜尿尤多，阳事无力。首选药物是（）。
A.鸡内金
B.桑螵蛸
C.海螵蛸
D.乌药
E.益智仁
参考答案：B
已知A={x|x2-3x+2=0}，B={x|ax-2=0}，A∪B=A，则由a可能的值构成的集合为______．
I don't know when he ___. But when he ___ back, I’ll let you know.
A．comes ; will come
B．will come; comes
C．comes;comes
D．will come; will come
