题目内容：

B.    Choose the words or expressions and complete the passage（选择最恰当的单词或词语完成短文)（12分） 

A young college student thought that he chose the wrong major(专业) at a common college, so he drank every day and didn't study at all. He became more and more ______.

    But he was never absent from Professor Yang's biology class. He liked the course. Besides, Yang's class was so interesting that he always listened carefully, never ______ whether the other students were paying attention or not in class.

    Once he put a ______ in the homework he handed in, saying: "Professor, it is said that today's college students are cheaper than potatoes. Do you agree?"   

    That day Professor Yang invited the young student to his home after class. When he came, he found the professor at a table with food on it. They drank ______ over their meal.   

    When they became half drunk, the professor took out a small potato that was sprouting(发芽的). "Do you know how much this costs?" he asked the young man. "It's soft but poisonous (有毒的) . Nobody will take it even if it's ______ . He then threw the potato away.

    The professor then showed him another potato. It was half the size of a football and quite round. "This potato is organic(有机的). It is not only large and fresh but also free of ______. It is in high demand and quite expensive."

    The young man was impressed by what he'd heard. "Be such a potato," said the professor.

1.A. surprised    B. confident    C. upset    D. attractive

2.A. caring about    B. playing with    C. getting ready for    D. depending on

3.A. coin    B. note    C. ticket    D. menu

4.A. luckily    B. sadly    C. worriedly    D. happily

5.A. free    B. beautiful    C. expensive    D. safe

6.A. money    B. exhibition    C. pollution    D. health