It took several hundred years ______ paper-making spread to western countries.

A．when

B．before

C．after

D．since

对异性服饰有特别爱好，反复穿戴以引起性兴奋，最恰当的诊断应为（）

A．异装症

B．易性症

C．同性恋

D．恋物症

E．摩擦症