10,000 dollars is a large sum of money，but it is still ______than we need for a new house[ ]

A. very few    

B. very little    

C. far fewer  

D. far less

某药t_1/2为12小时，每天给药两次，每次固定剂量，血药浓度大于稳态血药浓度98%所需要的时间最短是( )

A．7天

B．4天

C．1.5天

D．3天

E．1天