题目

阅读理解 The Chinese invented paper in 105 A. D.They mixed the bark of a tree and rags (破布) with water, put a screen intothe mixture, and lifted out a thin piece of wet paper. They dried the paper inthe sun. The Chinese kept their secretof how to make paper until a war with Muslims in the ninth century. The art ofpapermaking soon spread throughout the Muslim world. The Mayan Indians in CentralAmerica and Pacific Islanders also discovered how to make paper, but theirknowledge never spread to the rest of the world. For centuries, all paper wasmade by hand. Rags were the main material. Th计算：(π－3.14)0－ ()－1 =       ．