女士说My wedding cake on the back..可知蛋糕是结婚用的。

【听力原文】
M: I' ve just had a call from the bakers. They won' t be able to finish the cake this afternoon. We'll have to pick it up tomorrow morning. Who is going to pick it up?
W: Shall I get it? Andy could take me on his motorbike.
M: My wedding cake on the back of Andy' s motorbike? No way !