_____it was raining hard, ____they decided to start.[ ]

A. Although; but                  

B. But; although  

C. Although; \                      

D. Though; but

物理爆炸的条件是（）。

A.低温气体

B.容器满液且密封

C.低温液体

D.膨胀压力超过容器的耐压力