一个无盖长方体玻璃鱼缸的长6分米，宽2.5分米，高4分米．制造这样的一个雨缸至少要玻璃多少平方米？

The two vessels underway may collide with（）,if they don’t take immediate measures.

A.one to another

B.one the other

C.each the other

D.each other