1.From the passage we can learn that ________.
A.the 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
答案 D
解析 细节理解题。根据文章第三段中的“But this is caused by the turning motion of the Earth.Planets generally move from west to east.”可以判断出,太阳东升西落是由地球的回转引起的。故答案为D。
2.On July 19th Mars ________.
A.will pass the “opposition”
B.will appear to change its direction again
C.will begin to move westward
D.will appear to change its orbit again
答案 B
解析 细节理解题。根据文章第四段中的“Mars began its backward,or westward motion on May 11th.It will start moving eastward again on July 19th.”可知,火星在5月11日将向后或者说向西运行,在7月19号它将再次向东运行。故答案为B。
3.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.
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