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问题 单项选择题

如图为渗透作用实验，漏斗下口用半透膜封住(蔗糖分子不能通过)，漏斗内外均为蔗糖溶液，液面已经稳定在图示位置，则下列说法正确的是（）

A.此时漏斗内外溶液浓度相等

B.此时，单位时间内通过半透膜由内向外和由外向内扩散的水分子数相等

C.若将漏斗中的h段溶液全部抽走，使内外液面相平，一段时间后内外液面高度差还会恢复到h

D.若将漏斗迅速下移h的距离，使内外液面相平，一段时间后内外液面高度差还会恢复到h

答案

参考答案：B

阅读理解

阅读理解。

     Wen Jiabao is the premier of the world's most populous (人口众多的) country. But, millions of people

would rather call him "grandpa", Always in plain jackets, he seems an ordinary old man with a kind smile.

     Wen has visited the "left-behind" children before Children's Day. He visited Yang Saike's home,

a primary schoolboy in a village of Xingping County, Shanxi. Yang's parents were working in Fujian,

thousands of kilometers away. He was cared for by his grandparents. His parents fail to go home even

once a year. The premier held Yang in his arms and looked through his exercise book then praised him for

his hard work. When talked with many children and asked them many questions about their schooling and

 life. The premier asked the local governments to do something to protect and care for such children at

home and it their parents in cities not worry about their children.

     But in the face of disasters, he has the power to pull together the whole country. About two hours after

the deadly earthquake hit Sichuan Province, Permier Wen Jiabao was on a plane to the disaster area. Within

two days, he had seen almost all the worst hit cities and towns. The 65-year-old man was seen climbing

over damaged 26 buildings to encourage the trapped kids. And he shed (流泪) tears with sad families and

promised to help rebuild their homes.

1. Why do millions of people in China call Wen "grandpa"?  [ ]

A. Because he is the premier of the world's most populous country.

B. Because he is plain and seems an old ordinary old man with a kind smile.

C. Because he has the power to pull together the whole country.

D. Because he visited almost all the worst hit cities and towns.

2. What's the meaning of "left -behind" children?

[ ]

A. The children don't study hard, they fall behind others.

B The teachers often left the children behind.

C. The children always sit at the back of classroom.

D. The children's parents are working far away from them.

3. What did the premier do after he visited Yang Saike's home? [ ]

A. He held Yang in his arms.

B. He asked the local governments to care for the "left-behind' children.

C. He praised Yang for his hard work.

D. He shed tears with sad families.

4. Which of the following is NOT TRUE? [ ]

A. Yang Saike's parents usually go home after working.

B. Premier Wen has encouraged the whole nation to fight against the disasters.

C. Grandpa Wen always thinks of the people first.

D. The governments would do something to protect and care for people

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多项选择题

下列关于围堰拆除施工采用的安全防护设施正确的有（）。

A.由专业人员搭设

B.由施工单位安全主管部门按类别逐项查验

C.应有验收记录

D.验收合格后，方可使用
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