Native people along the narrow area of farmland have watched the sand move closer day by day.They’ve seen the river change course，and their only source (来源) of water thickened with mud.They’re very poor and have few choices.

　　But a new program，the Nile Basin Initiative (NBI)，is offering very practical assistance.The program is more than just a water­management project.It’s a plan for the social and economic development of a vast district：it concentrates on the needs of the poorest of the poor and the environment that supports them.

　　These are whole ecosystem problems，calling for united solutions (解决办法)．Half the Nile Basin’s countries are among the world’s poorest nations；yet，somehow，they must find the resources，skills and political will to overcome these challenges.

　　64．What are the great challenges the Nile Basin faces?

　　A．The development of shipping industry.

　　B．Overfishing of native people.

　　C．Water shortage and water quality.

　　D．Increasing population and tourism.

　　65．The underlined word “hyacinths” ( in Paragraph 3 ) refers to“________”．

　　A．animals

　　B．plants

　　C．rocks

　　D．salts

　　66．The program NBI is mainly aimed at ________.

　　A．preventing water pollution

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