#22471Mayan Civilisation机经题

Below is a text with blanks. Click on each blank, a list of choices will appear. Select the appropriate answer choice for each blank.

下面的文本有一些空格。点击每个空格会出现一组选项,请为每个空格选出最合适的答案。

The Classic era of Mayan came to an end around 900 AD. Why this happened is unclear; the cities were probably over-farming the land, so that a of drought led to famine. Recent geological supports this, as there appears to have been a 200-year drought around this time.

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