战国帛画反映的内容及艺术特点是什么？

----- It is 30 years since we last met.

------ But I still remember the story, believe it or not, _________ we got lost on a rainy night.

A．what

B．which

C．where

D．that

Don't __________ the window.Listen to me carefully.[ ]

A. look out    

B. look out for    

C. look out of    

D. look after

燃气种类用英文字母代表，天然气用（）代表。

A.R

B.Y

C.T

D.W

由两种或两种以上金属构成的制品．要按其所含重量最大的金属制品归类。( )

自行脱险后我们应尽快撤离险境和救人。