填空题

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.

【参考答案】

Y

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填空题

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

问答题

列举我国老年人生活存在的问题。 2.你认为应如何解决这些问题。