There was a time in early history of man when the days bad no names! The reason was quite : Men had not invented the week. In those days, the only division of times was the month, and there were too many days in the month for each of them to have a separate name. But when men began to build cities, they wanted to have a special day on which to trade, a market day. Sometimes these market day were fixed at every tenth day, sometimes every sh or every fifth day. The Babylonians decided that it should be every sh day. On this day they didn't work, but met for trade and religious festivals. The Jews followed their example, and kept every sh day for religious purposes. In this way the week came into being. The Jews gave each of the seven days a name, but it was really a number after the Sabbath(安息日) day (which Was Saturday). When the Egyptians adopted the seven - day week, they named the days after five planets, the sun and the moon. The Romans used the Egyptian names for their days of the week: the day of the sun, of the moon, of the planet Mars, of Mercury (水星), of Venus (木星), and of Saturn (土星). We get our names for the days not from the Romans but from the Anglo - Saxons, who called most of the days after their own gods.

Task 4In those days （）.

A．the smallest unit of time was the month
B．the smallest unit of time was the week
C．the year had been believed to be the only division of times
D．the months had no names either