—Are you interested in learning math?

—Yes, but I’m afraid to _______ too much time on math.

A．take

B．spend

C．pay

D．cost

制作一个长6分米，宽3分米，高4分米的长方体玻璃鱼缸，至少需要玻璃多少平方分米？（鱼缸的上面没有玻璃）制成的鱼缸体积是多少立方分米？