Mother:  I left two pieces of cake in the cupboard this morning, Johnny, and now there is only one piece left. Can you explain that?

Johnny:  Well, I suppose it was so dark that I didn't notice the other.

母亲：约翰尼，今天早上我在食品橱里放了两块蛋糕，现在只剩下一块了，你说是怎么回事？ 　

约翰尼：哦，我想是因为里面太黑，我没有看见另一块。