When you meet a new word in reading the English papers, you can guess its meaning but needn't

always ________ the dictionary.[ ]

A．look at  

B．attach to

C．pay attention to

D．refer to

绝缘子按安装方式分为（）。

A.悬挂、定位和腕臂支撑式三种

B.隧道和露天两种

C.瓷质和有机绝缘子

D.悬式、棒式、针式和柱式