文档介绍：2014年职称英语资格考试理工类A级阅读理解练习题
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Motion Sickness
Living in space looks like lots of fun. You can do certain things in space (like floating around, or pushing huge objects) that you cannot do on earth. But being in space can do things to you, too. If you stay too long in a gravity-free environment, your bones could e weak, and a small spaceship just might annoy you after a while, because space travel could make you seasick!
On July 4, 1982, after seven days orbiting the earth, astronauts Thomas K. Mattingly and Henry W. Hartsfield returned home. Although not all of the experiments on board worked properly, the flight basically seemed to be a ess except for one "little" thing: early in the flight, astronaut Hartsfield became "seasick".
Thomas Mattingly, who is also a jet pilot and is highly resistant to motion sickness on earth, did much better. Mattingly sailed through space with a steady stomach. But no one knows why Hartsfield felt uneasy and Mattingly did not.
So far it seems there is no reliable way to predict who will e motion sick in outer space and who will not. in all, at least four astronauts have suffered from space motion sickness. Russian and American scientists are working together to try to understand and solve the motion sickness. Space program officials worry that if so many highly-trained pilots get