根据下表提供的数据可知能大量共存的微粒组是 化学式电离常数CH3COOHK=1.

题型:选择题

问题:

根据下表提供的数据可知能大量共存的微粒组是

化学式电离常数
CH3COOHK=1.7×10-5
HClOK=3.0×10-8
H2CO3K1=4.3×10-7

K2=5.6×10-11

A.H2CO3、HCO3-、CH3COO-、ClO-

B.HClO、 HCO3-、CH3COO-、ClO-

C.HClO 、HCO3-、ClO-、CO32-

D.HCO3- 、CH3COO-、ClO-、CO32-

考点:离子共存
题型:选择题

阅读理解。

Dear David,

  You ask me about my family. Here are some things about my family. I

have a big family. They are my father my mother, my sisters Alice and Cindy a

nd I. My father is an actor. He is in many movies. He likes his job. My mother is a teacher.There are 40 students in her class. Alice is a sports star. She works in the City Sports Club. She doesn’t' t like her job. She thinks it is too boring. Cindy is a student. She and my mother are in the same (同样的) school. I-am 14 years old. I am a student, too. But I am not in my mother's school.

  My family are in the city, but my grandparents are in the countryside (乡村).

We often go to see them on weekends.

                                                               Best wishes,

                                                                Mike

1. There are _____ people in Mike's family.

A. 3        

B. 4            

C. 5

2. Mike' s mother is _____.

A. a teacher        

B. an actor          

C. a sports star

3. _____ doesn't like her / his job.

A. Mike's father    

B. Mike's mother    

C. Alice

4. Mike' s grandparents are _____.

A. in the City Sports Club  

B. in Mike's city  

C. in the countryside

5. What can we know from Mike's letter?

A. There are 44 students in Mike's mother's class.

B. Mike and Cindy are students.

C. Mike's father likes sports.

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B.无子

C.五不女

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C.2%

D.2.5%

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