During the next several weeks, you can see for yourself why the mysterious motion of Mars has caused so many people to wonder.

　　63. From the passage we can learn that

　　.

　　A. the sun and planets generally travel westward

　　B. Kepler studied the orbit of the planets in 1619

　　C. Copernicus’ theory well explained the motion of Mars

　　D. the Earth’s turning motion causes the sun to rise in the east

　　64. On July 19th Mars

　　.

　　A. will pass the “opposition” B. appears to change its direction again

　　C. will begin to move westward D. appears to change its orbit again

　　65. Why does Mars appear to be bigger and brighter when it passes “opposition”?

　　A. It is overtaking the earth. B. It follows the path of the sun.

　　C. It moves in an elliptical orbit. D. It travels in a circular orbit.

　　66. What is the best title for the passage?

　　A. The Recent Research into Mars

　　B. The Surprising Motion of Mars

　　C. The Great Discovery on Mars

　　D. The Wonderful Mystery of Mars

　　motion of the planets in 1619. Kepler在1619年出版了行星运动的完全理论” 可知，他的研究应该是在1619年之前，B错误；根据第六段最后一句“But his Sun – centered system still did not explain the observed motion of Mars very well.”可知，C错误；根据第三段第二、三句“Everyone knows the Sun rises in the east and sets in the west. But this is caused by the turning motion of the Earth.”可知D正确。

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