今日の読み物　レベル７

◇難関高入試（やや難）

It is easy to understand the calendar we use today. It was not always so easy. People had to try for thousands of years before they knew how to put together days, weeks, months, and years. More than 2,000 years ago, scientists in Egypt made a calendar. There were 10 days in a week, three weeks in a month, and 12 months in a year. This calendar showed a ――レベル７――[桐朋高]