问题 问答题 简答题

四显示自动闭塞区段通过色灯信号机的显示方式及其意义?。

答案

参考答案:

一个绿色灯光一一准许列车按规定速度运行,表示运行前方至少有三个闭塞分区空闲。

一个绿色灯光和一个黄色灯光—-准许列车按规定速度运行,要求注意准备减速,表示运行前方有两个闭塞分区空闲。

一个黄色灯光一一要求列车减速运行,按规定限速要求越过该信号机,表示运行前方有一个闭塞分区空闲。

一个红色灯光——列车应在该信号机前停车

填空题
阅读理解

阅读理解。

     Learning disabilities are disorders in the ways people understand or use language. They can affect the

ability to listen or think, or to speak, or to read, or to write and do mathematics.

     A person with a learning disability has unusual difficulty in developing these skills. Researchers believe

that learning disabilities are caused by differences in the way that the brain works with information. They

say children with learning disabilities are not unintelligent or do not want to work. Their brains just process

information differently than other people. Researchers say that one in five people in America has some kinds

of learning disability. Almost three million children in America receive some kinds of help in school for a

learning disability.

     How can you tell if someone has a learning disability? Experts look for a difference between how well

a child does in school and the level of intelligence or ability of the child. But there is no sign of a disorder.

A few signs of a learning disability include not connecting letters with their sounds or not understanding

what is read. A person with a learning disability may not be able to understand a funny story. They may

not follow directions. They may not read numbers correctly or know how to start a task Different people

have different kinds of learning disabilities. Another may have difficulty understanding what people are

saying. Still another may not be able to express ideas in writing.

     These different kinds of learning disabilities are known by different names. For example, a person who

has difficulty reading may have dyslexia. Someone who cannot do mathematics may have a disorder called

dyscalculia (计算困难).

     Experts say learning disabilities cannot be cured. But people who have them can be helped. Teachers

and parents can help young people with learning disabilities to learn successfully.

1. What does the passage mainly talk about?

A. Some kinds of help in school for a learning disability.

B. How to cure learning disabilities.

C. Causes of learning disabilities.

D. Learning disabilities.

2. It is believed that ____ is the main cause of learning disabilities.

A. different brain

B. unintelligence

C. not wanting to work

D. the way the brain works with information

3. People with learning disabilities may have no trouble ____.

A. understanding a funny story

B. following directions

C. dressing themselves

D. reading numbers correctly  

4. The underlined word in the 4th paragraph probably means ____.

A. difficulty in seeing

B. problem in reading

C. trouble in listening

D. brain disorder