题目

The New York Times recently published a report about scientists who are preparing astronauts for a trip to the Moon. The newspaper said the scientists want to make sure that their astronauts return home in good health. But there are many problems to solve before people are ready for long trips to the Moon. Humans developed on a planet with a surface that is more than 70 percent water. Our bodies are also about 70 percent water. When there is no gravity, that water moves up toward the head, raising the pressure in the skull(头骨). Arms and legs grow weak at what is called zero gravity because they no longer need to push against the force of gravity. Five years ago, astronauts who spent weeks in space reported a change in their eyesight. These astronauts were members of the crew on the International Space Station. Research showed a change in the shape of their eyes. Normally－round eyeballs had become flat during the time in space. The research also showed that the right eye was affected more than the left, and that men were more affected than women. Scientists could not find an explanation for the differences. Bone loss was one of the problems first reported by astronauts returning to Earth after longer stays in space. So scientists designed exercise machines to use on the space station. Tests showed that the exercise equipment helped space travelers keep their bones almost as strong as when they left Earth. There are other health issues for astronauts who spend a long time in space. They may have problems eating and sleeping. But the biggest health issue is exposure to radiation. On Earth, human beings are protected by the atmosphere and the planet’s magnetic field (磁场). In outer space, there is no such protection. 32. What does the underlined word“planet”in the second paragraph refer to? A. Moon.        B. Earth.          C. Mars.           D. Sun. 33. What will happen to people if there is no gravity?    A. The water in the body will move down to the feet.    B. The pressure in the skull will increase.    C. The brain will grow weaker.    D. The thinking will be slower. 34. What is the biggest problem that astronauts have to face? A. Sleeping.      B. Eating.      C. Listening.       D. Radiation.  35. What is the text mainly about?    A. A report about a trip to the Moon.       B. How to keep healthy as astronauts.    C. Some health problems astronauts face.    D. How to protect themselves as astronauts.  答案：BBDC

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