痉挛的主要治疗方法有（）。

A.减少产生痉挛的外界刺激

B.运动疗法

C.药物

D.神经阻滞疗法

E.以上均是

—What do you think of the music teacher ?

—______ she is an attractive lady, she can be extremely difficult to work with．

A．If

B．As

C．Because

D．While