与多模光纤相比较，单模光纤具有（）特点。 

A. 较高的传输率、较长的传输距离、较高的成本

B. 较低的传输率、较短的传输距离、较高的成本

C. 较高的传输率、较短的传输距离、较低的成本

D. 较低的传输率、较长的传输距离、较低的成本

It disgusted him when atheists attacked religion: he thought they were vulgar.()

A. insulting

B. base-minded

C. rough

D. vicious