44题 D段
①Surveys can cover a single large settlement or entire landscapes. ②In one case, many researchers working around the ancient Maya city of Copán, Honduras, have located hundreds of small rural village and individual dwellings by using aerial photographs and by making surveys on foot. ③The resulting settlement maps show how the distribution and density of the rural population around the city changed dramatically between AD 500 and 850, when Copán collapsed.
45题 B段
①In another case, American archaeologists René Million and George Cowgill spent years systematically mapping the entire city of Teotihuaczcán in the valley of Mexico near what is now Mexico City. ②At its peak around AD 600, this city was one of the largest human settlements in the world. ③The researchers mapped not only the city’s vast and ornate ceremonial areas, but also hundreds of simpler apartment complexes where common people lived.
问：B、D两个选项的顺序可以通过如下哪个选项确定？
A : between AD 500 and 850和around AD 600
B : In one case和In another case
C : this city的指代
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