【单选题】

Nobody expected to find them there, outside the city walls. The broken bones of 30 or 40 bodies lay with one on top of the other. It looked baD、There was no sign of battle.Everyone wondered why all these people had died at the same moment. Men came day after day to dig and remove the earth. They worked with great care, like detectives (侦探).Each .day something new was discovereD、Every bone was studieD、Soft brushes were used so that nothing was damageD、It all took a very long time, and there were many puzzles.

Deep in the ground they found an important secret.Below the bodies there was a building made of bricks (砖). Inside it lay the body of a woman. There were many things of value in the building with her—gold for her head, neck and arms, and clothes covered with golD、It was clear that the woman had been a queen. This explained why the other bodies were there. The queen’s servants(仆人) had killed themselves immediately after she had dieD、They wanted to be her servants in the next world too. This all happened 4,500 years ago in the world’s first city, Ur of theChaldees. Usually we learn about the past from books, but man lived for hundreds of thousands of years before any books were written. Only archaeologists (考古学家) can find out about our early history. This story is an example of how archaeologists work.
They believe the people had died at the same time because ______.
A、there had been a battle there
B、the bodies were found outside the city walls
C、the bodies looked bad
D、the bodies were lying on top of one another