—I hope you can keep the ________ forever.

—Of course. It's between us.

A.secret B.money C.address D.grade

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If you stay in space for a long time, will your body change? Mark Kelly and Scott Kelly from the United States will show you the answer.

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A change in appearance was easy to see. Scott, when he returned to the earth, was 5cm taller before. Another change was that Scott's eyesight declined after he came back. He found he couldn't see clearly. He also found that he couldn't move his legs so easily like before. Scientist found that after coming back to the earth, he took a little longer to understand things and make decisions.

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Further tests on the twins are still going on.NASA plans to send people to Mars in the 2030s,and the twins' research could help them prepare for those space trips.

1.Which of the following is Not true about Scott?

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C.He has never been to space before. D.He was once a NASA astronaut.

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5.The last paragraph mainly tells us ____________.

A.the fun of space travel

B.the success of the twins' research

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D.the purpse of the twins' research

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