58.D　 由第五段第一句可知。

57.A　 由第四段第二句可知。

56.C　 由第一段和第二段可知。

74.The first try of the hibernation technologythe six?person Human Outer Planets Exploration Mission to Jupiter’s moon Callisto.

A. will be　　　　　　　　　　 B. has been planned for

C. is certain to be　　　　　　 D. may be

73.In a hibernating state, a person needs ________.

A. less sleep　 B. more food　 C. less energy　 D. more movement

72.According to the article, the hibernation research _______.

A. is just an ideaB. is always a science fiction　

C. has already finished successfullyD. has made some progress

71.　What would be the best title for the text?

A.　Jesse Owens,　 A Great American Athlete

B.　Golden Moment - A Life?time Struggle

C.　Making A Living As A Sportsman

D.　How To Be A Successful Athlete

E

Have you ever dreamed of visiting a planet in the Milky Way (银河系)? While the trip sounds exciting, it would take years and years to reach your destination. So in the future, bedtime for astronauts may be more than a few hours of regular shut eye. They would have to sleep for years.

European researchers are now conducting hibernation experiments. The study may help them understand whether humans could ever sleep through the years it would take for a spaceflight to distant planets. "If there was an effective technology, it could make deep?space travel a reality," said Mark Ayre of the European Space Agency last month.

What seems like a science fiction is not completely unlikely. Researchers have been able to use chemicals to put living cells into a sleep?like state where they don’t age. They have now moved on to the small, non?hibernating mammals (哺乳动物) like rats.

A major challenge is the fact that cells can be very simple systems, whereas body organs are far more complex. "It’s like moving from a simple Apple computer to a supercomputer," said Marco Biggiogera, a hibernation researcher at Italy’s University of Pavia. Just like bears and frogs, the hibernation of human beings would cause a person’s metabolism (新陈代谢) to lower so they would need less energy.

Medical research, however, is just half of a spaceflight hibernation system. There is a challenge of designing a suitable protective shelter. Such a shelter would provide the proper environment for hibernation, such as the proper temperature. It would also have to monitor (监控) life functions and serve the physiological needs of the hibernator.

According to Ayre, the six?person Human Outer Planets Exploration Mission (使命) to Jupiter’s moon (木星的卫星) Callisto, could be an opportunity to use human hibernation. The mission aims to send six persons on a five?year flight to Callisto, where they will spend 30 days, in 2045.

70.　When Owens says "They have kept me alive over the years ",he means that the medals.

A.　have been changed for money to help him live on

B.　have made him famous in the US

C.　have encouraged him to overcome difficulties in life

D.　have kept him busy with all kinds of jobs

69.　We can infer from the text that Owens was treated unfairly in the US at that time because.

A.　he was not of the right race

B.　he was the son of a poor farmer

C.　he didnˊt shake hands with Hitler

D.　he didnˊt　 talk to the US president on the phone