填空题

By piecing together all kinds of evidence collected by various expeditions, the researchers believe the Mayas to be Indians, whose ancestors had come from Asia.

【参考答案】

N

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The ruins of the ancient city the explorers discovered in the late 1700s convinced them that the city was once lived by people of a highly advanced culture.

填空题

Evidence shows that the use of astronomic knowledge of astronomy greatly affected the life of the Mayas.