问题：
[单选题]For the force of Chinese Kung fu, what principle should be followed?
Aneither complicated nor beautiful, but practical.
Ban appropriate balance between hardness and softness.
Cpure hard force or pure soft force.
Dnever act upon anger.
[单选题]For the force of Chinese Kung fu, what principle should be followed?
Aneither complicated nor beautiful, but practical.
Ban appropriate balance between hardness and softness.
Cpure hard force or pure soft force.
Dnever act upon anger.
