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阅读下列短文，从每题所给的四个选项中选出最佳选项。
There are several explanations for why the circle is divided into 360 parts．Probably the best′explanation is connected with the Babylonians(巴比伦人)．
Many, many centuries ago, large distances were measured in the Babylonian mile．The Babylonian mile equaled about seven of our miles．Because of its length, the time needed to travel the Babylonian mile became a measure of time．One day was said to be twelve Babylonian time-miles．
About one thousand years Christ, the Babylonians began keeping records of star movements．They needed a way to record how much time passed between the moment they first saw a star and then observed it．They used the Babylonian time mile as their measure of time．
In order to have small units of time，the Babylonians divided their time-mile into thirty parts．The Babylonians believed that each trip around the sky was a circle．One complete trip around the sky, they reasoned, took one day．
You already know that one day was the same as twelve Babylonian time-mile．Since each time-mile was divided into thirty parts, the circular trip around the sky 12x30，or 360 parts long．That is how there came to be 360 degrees in a circle．
1．The purpose of this passage is to explain________．
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A．how the Babylonians measured the time of star movements
B．why the circle is divided into 360 degrees
C．the Babylonian mile and the Babylonian time-mile
D．the Babylonians'ideas about the sky
2．The Babylonian mile was first used to measure________．
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3．For what was the Babylonian time-mile divided into thirty parts？
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A．To make a day into 360 parts．
B．To make a circle into 360 parts．
C．To measure more exact distances．
D．To measure more exact time．
4．We conclude that one Babylonian time-mile equals________．
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5．Suppose O on the following circle was the time the Babylonians first saw a star, and then it took 13．5 Babylonian time-miles to see it again, where should the time be marked on the circle?
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