Up to now there has been a ____ online about whether or not life on the earth will be at an end in natural

disasters such as earthquakes and floods. [ ]

A. failure

B. focus

C. battle

D. bond

在超市里常常看到牛奶装在方形的容器中出售，而碳酸饮料则常装在圆形的容器中出售。下列关于此现象的原因解释不合理的是（）

A.视觉上圆形比方形更柔和舒缓，吸引更多的顾客购买

B.圆柱形易拉罐下底可做成半球形凹槽以承受更大的压力

C.牛奶通常需要存放在冷藏柜中，立方体容器更节约空间

D.碳酸饮料通常直接用包装罐饮用，圆柱体拿在手里更舒服