Reading Comprehension 从下列每篇短文的问题后所给的四个选择项中选出一个最佳答案。 Protagoras was a great teacher of ancient Athens. He taught many subjects, including the laws of argument and the use of language. A young man named Evalthus admired him very much and asked him to be his teacher, but he did not want to pay for his lessons at once. After some discussion, however, they agreed that Evalthus should pay only if he won his first case in the law courts. For if he won, he had been taught well. The lessons began and Evalthus proved himself to be a clever student. A time carne when he had reached the end of his studies, but he refused to pay Protagoras anything whatever. Protagoras took Evalthus to court and said to the judges, "Whatever you decide, I must be paid. For if you decide in my favor, then I win the case, and so I must be paid. But if you decide against me, then Evalthus has won his first case in the law courts; therefore, according to our agreement, he must pay me for his lessons. So, I must get my money whatever happens. After considering this argument, the Athenian judges found no fault in it. But they asked Evalthus to reply. "It is quite clear, said Evaltaus, "I must not pay. For either the judges will decide in my favor, or they will decide against me. If they decide in my favor, then I have won the case, and I must not pay. But if Protagoras wins, then I have lost my first case in the law courts. Therefore, according to our agreement, I do not have to pay him for the lessons. So I need not pay in any event." As both these arguments appeared to be faultless the judges were unable to come to a decision. They therefore ordered the two men to appear before them again a hundred years later.