问题 选择题

下列离子方程式正确的是(  )

A.用FeCl3溶液腐蚀铜线路板:Cu+Fe3+=Cu2++Fe2+

B.用稀硝酸清洗做过银镜反应的试管:Ag+NO3-+4H+=Ag++NO↑十+2H2O

C.向FeBr2溶液中通入过量的C12:2Fe2++2Br-+2Cl2=2Fe3++Br2+4Cl-

D.用二氧化锰与浓盐酸反应制取Cl2:MnO2+4H++2Cl-

  △  
.
 
 Mn2++Cl2↑+2H2O

答案

A.用FeCl3溶液腐蚀铜线路板的离子反应为Cu+2Fe3+=Cu2++2Fe2+,故A错误;

B.用稀硝酸清洗做过银镜反应的试管:3Ag+NO3-+4H+=3Ag++NO↑十+2H2O,故B错误;

C.向FeBr2溶液中通入过量的C12的离子反应为2Fe2++4Br-+3Cl2=2Fe3++2Br2+6Cl-,故C错误;

D.用二氧化锰与浓盐酸反应制取Cl2的离子反应为MnO2+4H++2Cl-

  △  
.
 
 Mn2++Cl2↑+2H2O,故D正确;

故选D.

阅读理解

阅读理解

       When people take a vacation, can they always enjoy it?

       The fact is that some people who travel for pleasure get no pleasure from it at all. Others, who travel

because they must travel, have a lot of fun doing it. What makes one trip more enjoyable than another?

       Any trip can be enjoyable if you plan it well. Every minute that you spend in planning your trip may

save your ten minutes of trouble during your trip. It may also add an hour of pleasure!

       Many resorts and cities around the world are popular during some months of the year and less

popular during other months. Find out if the places you are visiting have an "in" season and an"off" season. This may 'help you to decide when you want to go. The weather may help to find out them before you go.

根据短文内容,回答下列问题。

1. Do all people have fun taking a vacation?

                                                                                                        

2. Do we need to make a good plan before we take a vacation?

                                                                                                       

3. Are the resorts popular all the year round?

                                                                                                       

4. Is it a good idea to go to beaches in an "off"season?

                                                                                                       

5. How can you make your trip more enjoyable?

                                                                                                       

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