able to swim by the time they graduate, or the university won't give them a diploma (文凭), Liu said.

Many old students of this famous university had to meet the swimming challenge in its history. Liang Shiqiu, the famous writer who entered Tsinghua University in 1915, once failed the swimming test before his graduation. He had to do his best at the make-up examination（补考）. Luckily his second test got a pass from the head of the Division of Sports Science and Physical Education.

Why is the university connecting swimming ability with degrees? As a living skill, swimming is very important for students in the long run, since it is helpful in improving students' endurance (耐力) and it usually does less harm to joints and muscles as a water sport," said Liu Bo.

　　"Although Tsinghua has paid much attention to sports in its long history, fewer students are exercising in their spare time regularly," Liu said. "It's time to take serious action to ask students to exercise more to build up their bodies on campus."

28.What must a student do before graduating from Tsinghua University?

　A. Pass a swim test. B. Learn sports science.

　C. Show interest in swimming. D. Know the old students.

29.What's the purpose for the writer to talk of Liang Shiqiu?

A. To show he was famous.

　B. To introduce his works.

C. To advise others not to meet the challenge.

　D. To support the topic with this example.

30.Why does Tsinghua University pay so much attention to swimming?

A. It is a water sport. B. It has a long history.

C. It is not very harmful. D. It can make students stronger.

31.What can you infer about the students in Tsinghua University from the last paragraph?

　A. They like other sports except swimming.

　B. They are poor in health because they don't exercise.

　C. More and more students will attend swimming class.

　D. Fewer students would like to go to Tsinghua University.

Recently, we've been talking about how we need better teachers. There's no doubt that a great teacher can help in a student's learning but here's what some new studies are also showing: We need better parents.

Every three years, the organization called O.E.C.D. organizes exams as part of the Program for International Student Assessment(评估), or PISA, which tests 15-year-olds on their abilities to deal with real problems. America's 15-year-olds have