老年人便秘宜使用的药物是（）
A.液体石蜡
B.大黄
C.硫酸镁
D.酚酞
E.羧甲基纤维素
参考答案：A
— I don't care for baseball.
— How can you say you don't like something _____ you've never even tried it! [ ]
A. till
B. after
C. unless
D. when
移动式电气设备
