简述土壤产生缓冲作用产生的原因

商业银行开办银行卡业务应开业（）以上，并具有办理零售业务的良好业务基础。

A.6个月

B.6个月

C.1年

D.3年

下列句子顺序排列正确的一项是（　　　）。（2分）

①当时，他已经带领部队在被山洪围困的南城县沙洲镇水口村奋战了三天两夜，把被困群众全部解救出来后，本想让疲惫不堪的战士们好好睡一觉，可开拔的命令又到了。

②省武警总队副参谋长周智源接到驰援命令时是21日晚7点。

③“交给我们！”

④地方领导指着地图上的唱凯堤灵山何家村段：“这是决口处，水流最急，作业难度最大……”

⑤部队到达抚州的时间是21日晚8点半，在联合指挥部的调度会上，周智源只问了一句：“哪里最险，最急？”

A．②⑤④③①

B．②①⑤④③

C．⑤④③②①

D．②①⑤③④

日常生活中我们经常会看到烧开水时从壶嘴冒出的“白气”，刚从冰箱中取出的雪糕周围也有“白气”，如图所示．

（1）请说明这两种“白气”的形成同属于哪种物态变化？

（2）请仿照示例具体说明这两种“白气”的成因．

示例：冬天房间玻璃窗上的冰花是由室内玻璃窗附近空气中的水蒸气遇冷凝华形成的

膝上截肢假肢训练时应首先进行的训练是()

A．在平行杠内进行步行训练

B．以腋拐进行步行训练

C．平衡练习

D．从椅子座位上起立训练

E．上下楼梯的训练

阅读理解

     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 years, 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.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.

     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.

1. 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.

2. The underlined word "hyacinths" ( in Paragraph 3 ) refers to"________".

A. animals  

B. plants  

C. rocks  

D. salts

3. The program NBI is mainly aimed at ________.

A. preventing water pollution

B. changing the river course

C. improving living conditions of the poor

D. preventing land from becoming desert

4. What would be the best title of this passage?

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