20．A.significance B．diversity

　　C．value D．power

　　答案：B　考查名词辨析。 significance重要； diversity多样性； value价值； power力量。根据标题“America's Beauty Is in Its Diversity”可知，这就是美国之多样性，故选B。

　　.语法填空

　　阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

　　(2015·郑州市一模)

　　In the summer of 1848, in Guatemala, a man called Ambrosio Tut went into the jungle, as he did almost every day. Tut was a gum­collector(树胶采集者)，__1__ (look) for gum in the jungle. To do this, he had to climb the trees. __2__ this particular day, he got to the top of one tree and something caught his eye. He looked out across the trees and saw the tops of some old buildings.

　　Tut didn't really know what he had seen but he knew it was something __3__ (specially). He ran to tell the local governor, and together they __4__(walk)into the jungle. There they found Tikal(蒂卡尔)，the city that the Mayans (玛雅人) had built many hundreds of years before. The two men saw temples and pyramids, squares and houses, and places __5__ kings had lived when the Mayan people ruled the region.

　　For a long time before that day, local people had known that somewhere in the jungle there was an old Mayan city，__6__ no one had seen it for centuries. __7__ 200 and 900 AD, the city of Tikal had been the center of Mayan civilization in the region, but then the Mayans left __8__─nobody knows why! After 1000 AD, the jungle began to cover it and people forgot that it was there.

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