Scientists working in southern Mexico have discovered a tomb. The scientists are archaeologists--they study past
cultures. They believe that the tomb could be thousands of years old. They found it accidentally. Digging into the
ruins of a pyramid, they came across a stone wall. More digging showed that the wall was part of a stone room
containing four skeletons. Wooden roof supports had been used to frame the tomb. But the wood had fallen
down long ago. The pyramid's weight had been too great.

The tomb is___
A.perfect
B.famous
C.ancient
D.shallow