肝硬化引起的是（） A.肝浊音界上移 B.肝浊音界下移 C.肝浊音界消失 D.肝浊音

For the people living in the Nile Basin, the river is their life．This 6,825 km waterway, 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. 

Water shortage , already serious in Egypt and Sudan , will soon influence several other countries in the watershed as well．Today, about 160 million people depend on the Nile River for their living．Within the next 25 yeas ,the district's population is expected to double, adding to the demand brought about by growth in industry and agriculture．The frequent drought（干旱）adds to the urgency.

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．Water-borne diseases continue unchecked．In areas where it's hot and damp, water hyacinths choke off（阻止） lakes, dams and other sections of the river, making it difficult for fishing and other businesses to move forward.

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 water-management 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．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.

小题1:What are the great challenges the Nile Basin faces？    

A．The development of shipping industry.

B．Over fishing of native people.

C．Water shortage and water quality.

D．Increasing population and tourism.小题2:The underlined word “hyacinths” （in Paragraph 3） refer to “        ”.      

A．plants

B．animals

C．rocks

D．salts小题3:The program NBI is mainly aimed at           .                 

A．preventing water pollution

B．improving living condition of the poor

C．changing the river course

D．preventing land from becoming desert小题4:

A．People’s Life in Egypt and Sudan

B．Frequent Drought in Egypt and Sudan

C．The Poorest Countries in the Nile Basin

D．The Ecosystem Problems in the Nile Basin

关于欠税管理、税款退还和追征制度，下列表述正确的是( )。

A．欠税时间从规定的纳税期限届满之日至纳税人、扣缴义务人缴纳或解缴税款的当日

B．严格延期缴纳税款的审批，是防止欠税流失的重要制度

C．在退还税款的过程中，如果纳税人有欠税的，税务机关可以先用应退还的税款和利息，抵顶纳税人欠缴的税款和滞纳金

D．因税务机关的责任造成的未缴或者少缴税款，税务机关不得要求纳税人、扣缴义务人补缴税款

简述内质网的形态类型及各自功能特点。

男，60岁。下前牙松动1年。检查：两个下中切牙松动Ⅰ度，牙石(++)，探诊深度 7mm。全口其他牙牙石(+)，探诊深度普遍4～6mm，附着丧失3～4mm。最可能的诊断为

A．成人牙周炎

B．增生性龈炎

C．边缘性龈炎

D．牙周牙髓联合病变

E．快速进展性牙周炎

变形速度越大，可锻性（），压应力数目越多，可锻性（）。