阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

In our discussion with people on how education can help them succeed in life, a woman remembered the first meeting of an introductory _ 36 _ course about 20 years ago.

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.”

Twenty years later, the _ 43 _ could guess what the professor had in mind. He _ 44 _ himself, perhaps, as inviting his students to start an exciting _ 45 _ into an unknown world Invisible（无形的）to the _ 46 _ , which can be discovered only through scientific _ 47 _ . But the seventeen-year-old girl could not accept or even _ 48 _ the invitation. She was just _ 49 _ to understand the world. And she _ 50 _ that her firsthand experience could be the _ 51 _ . The professor, however, said that it was _ 52 _ . He was taking away her only _ 53 _ for knowing and was providing her with no substitute. “I remember feeling small and _ 54 _ ,” the women says, “and I did the only thing I could do. I _ 55 _ the course that afternoon, and I haven’t gone near science since.”