There are many things in different areas _____ we can do to reduce the possible dangers of AIDS.[ ]

A. where

B. there

C. what

D. that

杆塔分解组立，钢丝绳与铁件绑扎处应（）。

A、衬垫软物

B、衬垫硬物

C、绑牢

D、绑扎三道