——What is France famous _________ ?
——Grape wine . You know grape wine is made _________ grapes.
A:as , from
B:for , of
C:as , of
D:for , from
回答下列问题:
除去混在HNO3中的少量盐酸,可加适量的( )
已知f(x)=ax2+bx+1是定义在﹣2a,a2﹣3上的偶函数,那么a+b的值是( )
对H1N1甲型流感患者进行隔离治疗,从预防传染病的角度看,这是 ( )