A professor was giving a big test one day to his students.He handed out all of the test papers and went back to his desk to wait.Once the test was over,the students all handed the papers back in.The professor noticed ...A professor was giving a big test one day to his students.He handed out all of the test papers and went back to his desk to wait.Once the test was over,the students all handed the papers back in.The professor noticed that one of the students had at-展开更多
文摘A professor was giving a big test one day to his students.He handed out all of the test papers and went back to his desk to wait.Once the test was over,the students all handed the papers back in.The professor noticed that one of the students had at-
