雅思阅读高级课程讲义.doc

主讲：宋鹏昊 HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK HYPERLINK civilisation. Then around 2100 BC, a transformation began. Streets went uncleaned, buildings started to be abandoned, and ritual structures fell out of use. After their final demise, a millennium passed before really large-scale cities appeared once more in South Asia. C Some have claimed that major glacier-fed rivers changed their course, dramatically affecting the water supply and agriculture; or that the cities could not cope with an increasing population, they exhausted their resource base, the trading economy broke down or they succumbed to invasion and conflict; and yet others that climate change caused an environmental change that affected food and water provision. It is unlikely 96 / 111 that there was a single cause for the decline of the civilisation. But the fact is, until now, we have had little solid evidence from the area for most of the key elements, said Petrie. A lot of the archaeological debate has really only been well-argued speculation. D A research team led by Petrie, together with Dr Ravindanath Singh of Banaras Hindu University in India, found early in their investigations that many of the archaeological