the professor __37__the lecture hall, placed upon his desk a large jar filled with dried beans(豆), and invited the students to _38_how many beans the jar contained. after __39__shouts of wildly wrong guesses the professor smiled a thin, dry smile, announced the __40__ answer, and went on saying, ”you have just __41__an important lesson about science. that is: never__42__ your own senses.”
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