阅读下面短文并回答问题，然后将答案写在横线上（请注意问题后的词数要求）
[1] For the people living in the Nile Basin，the river is their life. This 6,825 km river，whose watershed (流域) covers three million square kilometers，flows through mountains，woodlands，lakes and deserts. Its potential for fishing，tourism and shipping is great — but so are its challenges.
[2] Water shortage，already serious in Egypt and Sudan，will soon influence several other countries in the watershed, too. Today，about 160 million people depend on the Nile River for their living. Within the next 25 years，the district's population is expected to double，adding to the demand brought about by growth in industry and agriculture. The frequent drought adds to the urgency.
[3] Water quality is also a problem. Precious soil is washed out to sea. Wastes from industry and agriculture create pollution. Higher concentrations of salt influence irrigated soils. Waterborne diseases continue unchecked. In areas where it's hot and damp，water hyacinths choke off lakes，dams and other sections of the river，making it difficult for fishing and other businesses to move forward.
[4] 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 of water thickened with mud. They're very poor and have few choices.
[5] But a new program，the Nile Basin Initiative，is offering very practical assistance. The program is a watermanagement project. It's a plan for the social and economic development of a vast district as well：it concentrates on the needs of the poorest of the poor and the environment that supports them.
[6] These are whole ecosystem problems，calling for united solutions．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 overe these challenges.
【小题1】What is the main idea of the second and third paragraphs? (No more than 10 words)
【小题2】Fill in the blanks in Paragraph 5 with proper words. (No more than 4 words)
【小题3】How large will the population of River Nile district be within the next 25 years?
(No more than 5 words)
【小题4】What do Nile Basin’s countries need to overe the challenges? (No more than 6 words)
【小题5】What does the underlined word “Its” (Line 3, Paragraph 1 ) refer to?
(No more than 3 words)
The problems/challenges people are facing in the River Nile district
网友回答
(答案→)The problems/challenges people are facing in the River Nile district
解析：本文讲述了尼罗河沿岸的人们现在所面临的严峻的问题，水污染，土壤污染等等各方面的话题。
【小题1】The problems/challenges people are facing in the River Nile district
推理题。根据2,3段Water shortage，already serious in Egypt and Sudan，will soon influence several other countries in the watershed, too.和Water quality is also a problem.说明这两段主要讲述的就是尼罗河区域的人所面临的问题。
【小题2】 More than / not only
根据下一句It's a plan for the social and economic development of a vast district as well：说明这也是一个社会和经济发展的几乎，说明他不仅仅是一个管理水的工程。故该词是指不仅仅；
【小题3】 320 million.
计算题。根据Today，about 160 million people depend on the Nile River for their living. Within the next 25 years，the district's population is expected to double，说明25年后人口增加一倍，就是32milion。
【小题4】 Resources, skills and political will.
细节题。根据文章最后一句somehow，they must find the resources，skills and political will to overe these challenges.
【小题5】 The river’s / River Nile’s
推理题。根据This 6,825 km river，whose watershed (流域) covers three million square kilometers，flows through mountains，woodlands，lakes and deserts. Its potential for fishing，tourism and shipping is great — but so are its challenges.
说明这里的its就是指尼罗河的。