问题 选择题

能用H++OH-=H2O表示的化学方程式是(  )

A.氢氧化钠溶液与醋酸反应

B.氢氧化铁与硫酸反应

C.氢氧化钡与硫酸反应

D.硫酸氢钠与氢氧化钠溶液反应

答案

A.醋酸为弱电解质,应写成化学式,不能用H++OH-=H2O表示,故A错误;

B.氢氧化铁难溶于水,应写成化学式,不能用H++OH-=H2O表示,故B错误;

C.氢氧化钡与硫酸反应生成硫酸钡沉淀和水,不仅仅发生H++OH-=H2O,故C错误;

D.硫酸氢钠与氢氧化钠溶液反应的离子方程式为H++OH-=H2O,故D正确.

故选D.

阅读理解

If you want to travel with a partner,you may ask for one on the Internet.There are some tips about how to choose a right partner on the Internet:

Unluckily,you can’t ask a person if he has a good feeling.If you ask,everyone will tell you that they do! It is important that you have to get to know your travel partner to find out what kind of feeling he really has.

You can tell a lot about a person’s feeling by the words he uses.Ask him about his worst trip.Is he laughing about it now,or still unhappy?Does his worst trip sound like an adventure to you?If so,he doesn’t match you.Having a good feelingis important for having a good time.Talk about the hotel you would like to stay in.See if you have the same habit of spending holidays.This is such a quick way to find a partner.

What’s more?Always keep in contact with(联系)your traveling partner when traveling.Don’t simply hang out without telling them,and don’t let them do it to you,either.

小题1:The passage mainly talks about how to find a right partner________.

A.in class

B.in school

C.on the Internet

D.in the neighborhood小题2:The second paragraph mainly tells us it is important________.

A.to find a partner

B.to find out the feeling of the partner

C.to ask if your partner has a good feeling

D.to look for a partner on the Internet小题3:The word “adventure” in Paragraph 3 means “________” in Chinese.

A.冒险

B.安全

C.刺激

D.兴奋小题4:What is the quick way to find if you have the same habit of spending holiday with a partner?

A.Talk about money.

B.Talk about study.

C.Talk about the place you want to go.

D.Talk about the hotel.小题5:The best title for the passage is________.

A.Have a Happy Holiday

B.Find a Right Partner for Traveling

C.Don’t Hang Out Alone

D.Make Sure You Have Good Feelings

单项选择题