问题 阅读理解

     阅读理解。

     Every year thousands of young people in England finish school and then take a year off before they

 start work or go to university. Some young people go to other countries and work as volunteers 

 (志愿者). Volunteers give their time to help people. For example, they work in schools or hospitals , or

 they do something helpful for the environment.

    Pauline Jones, 18 , lives in Cardiff , Wales. Next year she wants to go to university to study Chinese,

 but now she's living in Belize. Pauline says,"I'm working with other people here to save the coral reefs

 (珊瑚礁) in the sea near Belize. The reefs here are beautiful, but if the sea water is very polluted (污染),

 the coral will die. I'm helping to do research on the coral and the fish that live around the reefs. All over

 the world, coral reefs are dying. We need to do something about the problem before it's too late. "

     "I'm staying with a family here and I help do same housework. I don't get any money, but that's OK.

 I love my work here, and I'm learning a lot about the people of Belize...and myself! When I finish my

 work, I want to stay here for another three months. I want to travel around Belize and Central America. "

1. Some young people from England _____ after they finish school.

    A. go to university abroad

    B. spend one year abroad as volunteers

    C. go to work for money

    D. start work in schools or hospitals

2. Pauline Jones , an eighteen-year-old girl, is living in _____ now.

    A. England

    B. China.

    C. Belize

    D. Cardiff

3. Pauline Jones is _____ with other people.

    A. studying Chinese in a university    

    B. working to save the coral reefs

    C. helping do some housework

    D. doing some research in Wales

4. From the passage, we know that the coral reefs _____.

    A. will die because of the pollution  

    B. are not as beautiful as before

    C. cannot live without fish in the sea

    D. will probably be sold for money

5. Pauline Jones wants to       after she finishes her work as a volunteer.

    A. stay there for another year

    B. go back home to start work

    C. learn about the people's home

    D. travel around Central America

答案

1—5: BCBAD  

判断题
实验题

SiO2、SO2和CO2都是酸性氧化物,它们的化学性质具有一定的相似性;Mg和Na的化学性质也具有一定相似性。

某兴趣小组用如图所示装置进行Mg与SO2反应的实验。

(1)选择制取SO2的合适试剂________(填编号)。

①浓HCl ②浓H2SO4 ③Na2SO3固体 ④CaSO3固体

(2)上述装置还可优化,优化的方法是________________________________________,装置C中NaOH溶液的作用是___________________________________________________________

(3)甲同学推测Mg与SO2的反应和Mg与CO2的反应相似,则该反应方程式为_________________________________________;

乙同学的推测是:2Mg+3SO22MgSO3+S;丙同学的推测是:3Mg+SO22MgO+MgS,要验证甲、乙、丙三位同学的推测是否正确,丁同学作如下实验探究:

已知:MgSO3和MgS都微溶于水,能与盐酸发生复分解反应放出气体;H2S气体通入CuSO4溶液中出现黑色沉淀。

限选试剂:2 mol·L1盐酸、2 mol·L1硝酸、蒸馏水、2 mol·L1 NaOH溶液、品红溶液、澄清石灰水、2 mol·L1 CuSO4溶液;仪器和用品自选。

序号实验步骤预期现象和结论
取少量反应后所得固体于试管中 
向试管中的固体慢慢滴加____________,试管口塞上带导管的单孔塞,并将导管通入盛有________的试管中若试管中的________,则丙同学推测正确,若试管中的固体未完全溶解,且________,则乙同学推测正确
 

根据上述实验探究,能证明甲同学推测正确的操作和预期现象是

_____________________________________________________________。

(4)上述实验需要100 mL 2 mol·L1的盐酸,配制时选用________(选填10 mL、25 mL、50 mL或100 mL)量筒量取36.5%密度为1.19 g·mL1的浓盐酸的体积为________mL。