2. 外语
  3. When Jack Davis, 9, looks up at the night sky, he doesn’ t see just the stars. He sees his future. The fourth grader from New Je

When Jack Davis, 9, looks up at the night sky, he doesn’ t see just the stars. He sees his future. The fourth grader from New Je

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问题    When Jack Davis, 9, looks up at the night sky, he doesn’ t see just the stars. He sees his future. The fourth grader from New Jersey has a deep interest in outer space and the alien (外星的) beings he thinks might live there.
   In July, Jack heard that NASA was looking for a new planetary protection officer and decided he was the right person for the job. The position, which focuses on preventing astronauts from accidentally bringing extremely small, potentially dangerous alien life-forms back to Earth and ensuring that astronauts do not take Earth-based germs with them into space, pays from $124, 406 to $187, 000 per year.
   Jack wrote a letter to NASA, noting his qualifications for the job. " My sister says I am an alien, " Jack wrote, pointing out that since he is young, he can "learn to think like an alien". He signed the letter "Jack Davis, Guardian of the Galaxy".
   Within days, Jack received a personal letter from NASA’ s planetary science director, James L. Green. "We are always looking for bright future scientists and engineers to help us, " Green wrote. "I hope you will study hard and do well in school. We hope to see you here at NASA one of these days!"
   Jack said he was "shocked" when Green’ s response arrived. "I shouted, I got a letter from NASA!"
   Green says he loves to answer letters from children. He calls his response a "gravity assist". Spacecraft use gravity assistance from objects like planets and moons to help power the craft toward another celestial(天上的)body. Green hopes a reply can influence a person’ s path in life in a similar way.
In the last paragraph, the author intends to______.
选项 A、support Green for using gravity assist in projects
B、introduce the concept of gravity assist
C、guide young people by giving them a gravity assist
D、explain how Green’ s letter serves as a gravity assist
答案D
解析 推理题。根据文章最后一段可知，格林说他喜欢回复孩子们的来信，他把他的反应称为“重力辅助”。航天器用来自行星和卫星等物体的重力，向飞船提供动力帮助飞船飞向另一天体。格林希望他的回复能以同样的方式影响一个人的人生道路。因此，作者解释了格林的信是如何作为重力辅助起作用的，故本题选D。选项A(支持格林在项目中使用重力辅助)文中并未提及。选项B(介绍重力辅助的概念)过于片面。选项C(给年轻人提供重力辅助)是格林的信的作用，并不是作者。
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