Finally, a German mathematician named Johannes Kepler published a complete theory of the motion of the planets in 1619. He had carefully studied the motion of Mars for many years.

　　Johannes Kepler discovered that the planets do not move in circular orbits around the sun. Instead, they travel in flattened orbits called ellipses. Mars’ elliptical orbit is the cause of its unusual brightening this year and its apparent large size.

　　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?

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