Liu Ming is my chemistry‘ teacher. He is an ordinary-looking little man with thick glasses, but he has a strange way of making his classes lively and interesting.

　　I remembered his first lesson. He put three bottles on the desk. One was filled with kerosene, one with castor oil, and one with vinegar. And he said "Now watch carefully. Pay attention to everything that I do." He held up one of his fingers and dipped it into the cup after he mixed the three kinds of liquid in a big cup together. A few seconds later, he took his finger out, put it in his mouth and sucked it. "How delicious! You must do everything that I do." said he. And then we did it like him. lmmediately we made a face. The mixture tasted horrible.

　　It was first chemistry lesson. I never forget it.

　　劉明是我的化學老師，他是一位相貌平常、個子矮小的人，戴著一副深度眼鏡。但他有一種奇妙的方法使他的課上得生動有趣。

　　我記得他上的第一堂課，他把三個瓶子放在桌子上，一個裝滿煤油，一個裝滿蓖麻油，一個裝滿醋。他說：“現(xiàn)在你們仔細地看，注意我做的每一件事情�！彼�把三種液體混合在一個大杯子里之后，就把一個指頭浸在裝有混合物的杯子里。幾秒鐘以后，他把指頭拿出來放到嘴里去吮吸。然后說：“味道多么好呀!你們必須照我做的`一模一樣地去做�！苯又�我們都按照他做的去做。我們立即做出鬼臉，這種混合物太難吃了。

　　我永遠忘不了我白勺第一節(jié)化學課。

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