------ How was your trip to Yungang Caves during your National Day holiday?

-------- Wonderfully! I’ve never had _______ one before．

A．a pleasant

B．a more pleasant

C．a most pleasant

D．the most pleasant

经皮神经电刺激疗法的镇痛作用，是由于该疗法刺激兴奋了感觉神经的（）

A.痛觉神经末梢

B.所有传入纤维

C.粗纤维

D.细纤维

E.痛觉纤维