题目内容：
[A] For example, the Mocha lords of Sip an in coastal Peru were buried in about ad 400 in fine cotton dress and with exquisite ornaments of bead, gold, and silver.
[B] By 40,000 yeas ago people could be found hunting and gathering food across most of the regions of Africa.
[C] Archaeological studies have also provided much information about the people who first arrived in the Americas over 12,000 years ago.
[D] They were simple plants that had not devloped sepa-appeared in the Silurian period.
They were simple plants that had not developed separate stems and leaves.
[E] One site in Tanzania even reveals footprints of humans from 3.6 million years ago.
[F] One research project involves the study of garbage in present-day cities across the United States.
[G] Other sites that represent great human achievement are as varied as the cliff dwellings of of the ancient Anasazi (a group of early Native Americans of North America)at Mesa Verde, Colorado：the Inca city of Machu Picchu high in the Andes Mountains of Peru；and the mysterious, massive stone portrait heads of remote Easter I sand in the Pacific.
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