问题 单项选择题

在下列几种无机胶凝材料中,哪几种属于气硬性的无机胶凝材料?

A.石灰、水泥、建筑石膏

B.水玻璃、水泥、菱苦土

C.石灰、建筑石膏、菱苦土

D.沥青、石灰、建筑石膏

答案

参考答案:C

解析:气硬性无机胶凝材料只能在空气中硬化,也只能在空气中保持或继续发展其强度。常用的气硬性无机胶凝材料有石膏、石灰、水玻璃、菱苦土(续质胶凝材料)等。这类材料适用于地上或干燥环境。

不定项选择
阅读理解

阅读理解。

     The child of today owes much of its pleasant school life to the work of Maria Montessori and others who

felt as she did.   

     Maria Montessori was born in 1870 in northern Italy. Both her parents were well educated.   

     While Maria was a student, she took great interest in the study of the particular nature of the child's mind.

It came to her that small children should have freedom to learn.   

     Maria became a doctor and a professor at Rome University. In 1907, after working with backward students, she was given a chance to try out her ideas on children. There were sixty children, aged three to six, in the

Children's House. The rooms were bright and colorful. Maria let the children make their own choice of what

they wanted to do and work with their own speed. They became busy, peaceful and happy.

     Maria Montessori was one of the world's greatest teachers. She traveled in Europe, America and Far East.

She thought that true education, providing (提供) for the real needs of the child, would produce wise and

happy grown-ups and therefore a peaceful world. Her original way of education has changed our whole idea

of what childhood is.

     Maria Montessori died in Holland at the age of eighty-two.

1. The short passage is mainly about _____.

A. the education of backward students   

B. a new idea of education

C. the importance of proper education   

D. the life of Maria Montessori

2. Maria traveled a lot in the world to _____.

A. teach the backward students

B. enjoy her life in real nature

C. spread her ideas of teaching

D. study the situation of education

3. In what way did Maria teach the children in the Children's House?   

A. She taught them the best way of learning well.   

B. She let them learn in a very pleasant way.   

C. She taught them by showing them how to do things.

D. She just let them choose the most interesting subjects.

4. We learn from the passage that _____.   

A. Maria left her homeland in order to study abroad   

B. Maria didn't get married   

C. Maria's own parents were her teachers   

D. Maria fully understood the child's mind