David lives on the ________ floor. It is too high, so he has to take a lift every day.

A．fourty

B．fourtieth

C．forty

D．fortieth

调节血脂药物普罗布考最常见的不良反应为（）

A.心电图Q-T间期延长

B.胃肠道不适

C.室性心动过速

D.血小板减少