There are   __    in the reading room, but many of those books aren’t     __   to read．      [ ]

A. enough books，enough easy      

B. enough books，easy enough      

C. book enough，easy enough      

D. book enough，enough easy

独行菜的干燥成熟种子是（）.

A．南葶苈子 

B．菟丝子 

C．酸枣仁 

D．北葶苈子 

E．沙苑子