
14.Why did the carliest people in southern Mexico leave their inhabitants?
A.They didn't like to stay in a place too long.
B.Too many people lived in a crowded place.
C.The inhabitants were burned down by fires.
D.They looked for a better living condition.
15.What's the suitable title for the text?
A.New evidence for the earliest people in America.
B.How the carliest poople in America hunted or lived
C.Modern tochniques help scient ists find more evidence.
D.The reason why the earliest people left southem Mexico.