He then filled a cup with some of the petrol, some of the castor oil and some of the vinegar. As the students watched him quietly, he mixed the three together. After that, he held up one of his fingers and showed it to the class. He then dipped it into the cup. After a few seconds he took his finger out. "Now watch" he said. " Remember, you must do everything as I do."

　　He put a finger in his mouth, tasted it and smiled, looking rather pleased. Then he handed the cup around the class of students. Each student dipped a finger into the mixture and sucked it. Instead of smiling, each of them made a face. The mixture tasted terrible.

　　When the cup was at last returned to the teacher, he said sadly, “I ' m sorry, none of you watched carefully enough. Yes, I sucked a finger, but the finger I put into my mouth was not the one I had dipped into the cup. "

　　It was Paul’s first important lesson as a student of chemistry and he never forgot it.

　　59. What kind of teacher is he?

　　A. Excellent at teaching.

　　B. Ordinary-looking.

　　C. Strange.

　　D. Funny.

　　60. Why did the teacher ask the students to watch for the second time?

　　A. He wanted to have the students’ attention.

　　B. He wanted the students to see what he would mix.

　　C. He wanted the students to learn how to do experiments.

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