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ific purpose: to inform audience how the Great Wall of China was built. ? Central idea: the Great Wall of China was built in three major stages. ? Main points:Qin dynasty ? Han dynasty ? Ming dynasty ? Specific purpose: to inform audience your educational backgrounds ? Central idea: in three major stages. ? Main points: Spatial order ? Specific purpose: to inform audience about the three major regions in Italy ? Central idea: northern, southern and central Italy have their own identities and attractions. ? Main points: Problemsolution order ? Specific purpose: to persuade audience tougher measure are needed to control illegal selling of antiques. ? Central idea: illegal selling of antiques is a serious problem that requires a bination of government action and individual awareness. ? Main points: ? Specific purpose:to persuade audience that China should implement stricter law enforcement to prevent accidents in coal mines. ? Central idea: ? Main points: Topical order ? Specific purpose: to inform audience about the achievements of da Vinci ? Central idea: painter, an inventor, an astronomer ? Main points: ? Specific purpose: to persuade audience that China should continue its program of space exploration ? Central idea: ? Main points: ? Specific