问题 选择题

下列离子方程式正确的是

A.稀硝酸与氢氧化钾溶液反应H++OH=H2O

B.铝与稀盐酸反应Al+2H+=Al3++H2

C.三氯化铁溶液与氢氧化钠溶液反应FeCl3+3OH=Fe(OH)3↓+3C1

D.二氧化碳与石灰水反应 CO2+2OH=CO32+ H2O

答案

答案:A

题目分析:A、硝酸与氢氧化钾都属于易溶的强电解质,生成的硝酸钾也是易溶的强电解质,符合离子方程式的书写原则,正确;B、电荷不守恒,错误;C、三氯化铁是易溶强电解质,应拆成离子形式,错误;D、二氧化碳与石灰水反应有碳酸钙沉淀生成,错误,答案选A。

阅读理解

阅读理解。

     In Japan, you say "itadakimasu"("I am going to start")before eating, and "gochisosam(deshita)"

("Thank you for the meal")after finishing the meal.

◆Eating rules

     Blowing your nose in public, and especially at the table, is considered bad manners.It is considered

good manners to eat up all the things in your plate.Unlike in some other parts of East Asia, it is

considered bad manner to burp(打嗝).After eating, try to move all your dishes back to the same

position they were at the start of the meal.

◆Drinking rules

     When drinking alcohol(酒), it is a good manner to serve each other, instead of serving yourself.

Check your friends' cups from time to time and refill(重新注满)their drinks if their cups are getting

empty.If someone wants to serve you more alcohol, you should quickly empty your glass and hold

it towards that person.

     While it is considered bad manners to become drunk in some formal restaurants, the same is not

true for other small restaurants, as long as you do not trouble other guests.

     Do not start drinking until everybody at the table is served and the glasses are raised for a drinking

salute(口号), which usually is "kampai".

1.In Japan, you say "itadakimasu" ______.  

A.before eating

B.while eating

C.after eating

D.before drinking

2.All these are good manners in Japan except ______.

A.eat up all the things in your plate

B.after eating, move all your dishes back

C.serve alcohol to each other

D.blow your nose in public

3.From the second paragraph we may know that ______.  

A.in Japan you may burp after eating 

B.in some East Asian countries you may burp after eating

C.in some West Asian countries you may burp after eating

D.in the western countries you may burp after eating

4.If someone wants to serve you more alcohol in Japan, you should______.    

A.serve them quickly

B.refuse it politely

C.say "That's enough"

D.empty your glass and hold it

5.Which of the following is the right drinking rule?  

A.When drinking alcohol, it is a good manner to serve yourself.

B.Check your friends' cups from time to time and refill them if they are empty.

C.It is considered bad manners to become drunk in all the restaurants.

D.Start drinking if only one person is not served.

多项选择题