If you stay in space for a long time，will your body change（ 改变）？Mark Kelly and Scott Kelly from the USA will give you the answer.
Mark and Scott are twin brothers. They were once great astronauts in NASA （美国国家航空航天局）.From 2015 to 2016，Scott spent 340 days at the International Space Station.But Mark still stayed on the earth.Scientists wrote down some information about the twins before，during and after the space travel.They used the information to study how space travel changed the human body.
The full results of the studies will come out in a year or two.But scientists showed us some early findings.When Scott came back from space，he changed a lot.He was 5 cm taller than before.His eyesight became worse.He found that he couldn't see things clearly.Another change was that he couldn't move his legs easily just like before.Scientists also found that after Scott came back to the earth，it took him much longer to understand things and make decisions.As for Mark，he could do so as well as before.
Scientists say when people grow old，their telomeres （染色体端粒） will get shorter.Mark's telomeres kept getting shorter.However，during Scott's stay in space，his telomeres got longer.Further studies on the twins are still going on.NASA plans to send humans to Mars in the 2030s，and the twins' studies can help them get ready for the space travel.
根据材料内容选择最佳答案。
（1）From the second paragraph，we know Scott stayed at the international space station for CC.
A．three months
B．half a year
C．almost one year
D．two years
（2）What does the underlined word "They" refer to？ AA
A．The twins.
B．The scientists.
C．The results.
D．The bodies.
（3）What happened to Scott when he came back from space？ CC
A．He became shorter than before.
B．He could see things more clearly than before.
C．It was a little hard for him to move his legs.
D．He could make decisions more quickly than before.
（4）What's the best title for the text？ DD
A．Twin brothers' interesting space travel
B．What astronauts' life is like on space
C．When humans can move to other planets
D．How space travel changes the human body
（5）Where is the text probably from？ CC
A．A history book.
B．A picture book.
C．A science report.
D．A sports report.
【答案】C；A；C；D；C
【解答】
【点评】
声明：本试题解析著作权属菁优网所有，未经书面同意，不得复制发布。
发布：2024/4/20 14:35:0组卷：2引用：1难度：0.7
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