四減四等于幾？
2008-12-22 06:52:04吳瓊
中學生英語·外語教學與研究 2008年1期
吳 瓊
One day, the teacher inquiredof Sam," How much is four minusfour?" Sam was tongue-tied. Theteacher got angry and said,"What afool!You see, if I put four coinsin your pocket, but there is a holein your pocket and all of them leakout, now what is left in your pock-et?" "The hole," replied Sam.
