问题 选择题

下列叙述正确的是

A.根据Ksp(PbI2)>Ksp(AgCl)可以得出PbI2在水中的溶解能力比AgCl大

B.常温下,同浓度的Na2CO3与NaHCO3溶液相比,NaHCO3溶液的pH大

C.等物质的量浓度的NH4Cl溶液和NH4HSO4溶液,后者的c(NH4+)大

D.常温下pH=7的氨水与硫酸铵的混合液中c(NH4+)与c(SO42-)之比小于2

答案

答案:C

A 错误,两种物质的类型不同

B 错误,碳酸根离子水解程度比碳酸氢根离子水解程度大,故同浓度的Na2CO3比NaHCO3溶液碱性强。

C 正确,NH4HSO4电离出氢离子,抑制了铵根离子水解,故NH4HSO4溶液铵根离子浓度大于等物质的量浓度的NH4Cl溶液。

D 错误,因为pH=7,c(NH4+)与c(SO42-)之比等于2。

阅读理解

阅读理解

Problem:

I'm bored. We have a day off because of the heavy rain. If you didn't go to school today, what would you do? Why?LindaSome advice:

       If I were you, I would be at home doing something, such as making my bed or helping my mother do

some chores. That way, my room would be clean and my parents would be happy.Tina  I would do what

I love! Maybe I would help Mom do some cooking. I would learn how to make dumplings.Kathy  I don't have enough time in one day to do all the things I want to. People who get bored usually don't have a good imagination (想象力). There are lots of different books to read, websites to surf, people to visit and things to make.June  Well, if I were you, I would watch a good movie and then take a good nap (小睡). Your

brain (脑子) and body will then be relaxed and ready for classes the next day.

根据材料内容,选择最佳选项。

1. What's Linda's problem?

A. She doesn't have a job.

B. She feels bored.

C. She hates rainy days.

D. She feels awful at school.

2. Who would watch a movie if she had a day off?

A. June.

B. Kathy.

C. Lisa.

D. Tina.

3. What would Kathy probably like to do on her day off?

A. She would like to cook.

B. She would like to sleep.

C. She would like to read.

D. She would like to watch TV.

4. June would do all of the following EXCEPT      . 

A. visit friends

B. surf the Internet

C. read books

D. lie in bed

5. What do we know from the reading?

A. Tina doesn't like to do any housework.

B. Kathy likes to do the same things as Tina.

C. Lisa thinks it would be helpful to Linda to get relaxed.

D. June used to be busy, but now she has enough time to relax.

多项选择题