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阅读下列短文,根据短文内容填空。在未给提示词的空白处仅填写1 个适当的单词,在给出提示词的空白处用括号内所给词的正确形式填空。

Most people know a leap year is every four years and that it has something to do with the earth circling the sun. But many may not be aware of  1.purpose of this extra day. Over the past centuries, February 29 th 2.( cause) some unusual customs, wild rumors and strange superstitions. It's all about the sun ! We grew up being told the earth takes 365 days 3.( make) a complete circle around the sun, but it takes 365 days, 5 hours, 48 minutes and 45 seconds.

高三英语语法填空中等难度题

少年,再来一题如何?
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