--- What do you think of receiving and giving gifts?

--- I think the art of receiving a gift is _____ than the art of giving.

A．much more difficult

B．very more difficult

C．much difficult

D．as difficult as

酸枣仁与远志共有的药理作用是

A．镇咳
B．祛痰
C．抗惊厥
D．降温
E．降血脂