下列化合物中既有离子键又有共价键的是 A．NaOH B．H2S C．CaCl2

搜题请搜索小程序“爱下问搜题”

问题选择题

下列化合物中既有离子键又有共价键的是

A．NaOH

B．H2S

C．CaCl2

D．H2O2

答案

答案：A

A中既有离子键又有极性共价键；B中只有极性共价键；C只有离子键；D中既有极性共价又有非极性键；所以正确的选项为A；

阅读理解

阅读理解。

There is Liu Fei's room. It's a small but nice room. On the wall, there are two maps. One is a map

of China, the other is of the world. There's a desk in front of the window and on the desk there is a clock.

Near the clock there is a glass. There's some water in it. And there are two pencils, one pen and some

books on the desk too. There is a chair on the floor and under the chair there's a ball. Liu Fei often

studies in his room and he likes his room very much.

1. Li Fei's room is ______.

A. big and nice

B. small and nice

C. big and bad

D. small and bad

2. There is some ______ in the glass.

A. milk

B. water

C. tea

D. orange

3. There are some books ______.

A. on the chair

B. on the desk

C. on the floor

D. on the wall

4. What can you see on the wall of the room?

A. Two maps.

B. A clock.

C. A chair.

D. A window.

5. Where is the pen?

A. On the floor.

B. In the desk.

C. Under the chair.

D. On the desk.

名词解释

碑版