W: How were your exams,Mike? M: Not too bad. But I'm sure I made some mistakes in the science paper and maths paper. W: Me, too. The science paper was not easy this time, was it? M: It seems that our new science teacher likes to give us tough exams. W: I have the same feeling. He looks only 25 or so. M: Maybe he hopes to make us pay more attention to his lessons in this way. W: Really? M: Well. I'm only joking., Question: Why is the science exam diff icult? (A) The teacher is too young and less experienced. (B) The teacher likes to give hard exams. (C) We don't know.
(C) We don't know.