【正确答案】
C
【答案解析】TEACHER: Good afternoon, everybody.
STUDENTS: Good afternoon, Mr. Robot.
TEACHER: Today we will continue our lesson about a people in ancient central Mexico, Aztec, whose civilization was at its height in the early 16th century. Could someone tell me what we mainly talked about in the last section? Jerry?
jerry： Yes, sir! Last class we have learned about Spanish conquest of the capital of Aztec Empire, Tenochtitlan, in 1591.
teacher： Good. Now we will open up to a new part on Aztec. During the 1970s, surveys of patterns of settlement turned up the startling discovery that the Aztec period witnessed one of the major population explosions of antiquity.
jerry: Population explosions?
teacher： Exactly. The number of people in the Valley of Mexico, the heartland of the Aztec Empire, increased from 175,000 in the early Aztec period, that is, from 1150 to 1350, to nearly one million in the late Aztec period, from 1350 to 1519. Similar patterns of growth occurred in other parts of Aztec territory as well.
jerry: Oh, the class sounds to be more and more interesting.
teacher： Yes. Now please look at these pictures about ancient Aztec’s territory...