问题 填空题

PtCl2(NH3)2可以形成两种固体,一种为淡黄色,在水中的溶解度小,另一种为黄绿色,在水中的溶解度较大,请回答下列问题:

(1)PtCl2(NH3)2是平面正方形结构,还是四面体结构_____________

(2)请在以下空格内画出这两种固体分子的几何构型图,淡黄色固体:_____________,黄绿色固体:

_____________

(3)淡黄色固体物质是由_____________分子组成,黄绿色固体物质是由_____________分子组成(填“极性分子”或“非极性分子”)

(4)黄绿色固体在水中溶解度比淡黄色固体大,原因是__________________________。

答案

(1)平面正方形

(2)

(3)非极性;极性

(4)根据相似相溶原理,因为淡黄色固体为非极性分子,所以在水中的溶解度小,而黄绿色固体为极性分子,所以在水中的溶解度大

阅读理解

阅读理解。

     Sandra Cisneros was born in Chicago in 1954 to a Mexican American family. As the only girl in a

family of seven children, she often felt like she had"seven fathers," because her six brothers, as well as

her father, tried to control her. Feeling shy and unimportant, she retreated (躲避) into books. Despite

her love of reading, she did not do well in elementary school because she was too shy to participate.

     In high school, with the encouragement of one particular teacher, Cisneros improved her grades and

worked for the school literary magazine. Her father encouraged her to go to college because her thought

it would be a good way for her to find a husband. Cisneros did attend college, but instead of searching for

a husband, she found a teacher who helped her join the famous graduate writing program at the University

of Iowa. At the university's Writers' Workshop, however, she felt lonely----a Mexican American from a

poor neighborhood among students from wealthy families. The feeling of being so different helped Cisneros

find her "Creative voice."

     "It was not until this moment when I considered myself truly different that my writing acquired a voice.

I knew I was a Mexican woman, but I didn't think it had anything to do with why I felt so much imbalance

in my life, but it had everything to do with it! That's when I decided I would write about something my

classmates couldn't write about."

     Cisneros published her first work, The House on Mango Street, when she was twenty-nine. The book

tells about a young Mexican American girl growing up in a Spanish-speaking area in Chicago, much like the

neighborhoods in which Cisneros lived as a child. The book won an award in 1985 and has been used in

classes from high school through graduate school level. Since then, Cisneros has published several books

of poetry, a children's book, and a short-story collection.

1. Which of the following is TRUE about Cisneros in her childhood?

A. She had seven brothers.

B. She felt herself a nobody.

C. She was too shy to go to school.

D. She did not have any good teachers.

2. The graduate program gave Cisneros a chance to _____.

A. work for a school magazine

B. run away from her family

C. make a lot of friends

D. develop her writing style

3. According to Cisneros, what played the decisive role in her success?

A. Her early years in college.

B. Her training in the Workshop.

C. Her feeling of being different.

D. Her childhood experience.

4. What do we learn about The House on Mango Street?

A. It is quite popular among students.

B. It is the only book ever written by Cisneros.

C. It wasn't success as it was written in Spanish.

D. It won an award when Cisneros was twenty-nine.

单项选择题