_____ she couldn’t understand was ______ more and more students showed great interest in

computer games and some are even addicted to them. [      ]

A. That, what

B. What, why

C. What, because

D. Why, that

气瓶搬运的安全要求，以下哪个说法是错误的（）

A.气瓶搬运应使用专门的抬架或手推车

B.用汽车运输气瓶，气瓶应横向放置并可靠固定

C.气瓶押运人员可以坐在车厢内

D.禁止将氧气瓶与乙炔气瓶、易燃物品或装有可燃气体的容器放在一起运送