炮采工作面容易出现的问题主要有：______ 、 ______ 和 ______ 。

触电一般原因有哪些?

Passage 3

Questions 11 to 15 are based on the following passage:

The cowboy is the hero of many movies,. He is, even today, a symbol of courage and adventure. But what was the life of the cowboy really like?

The cowboy’s job is clear from the word cowboy. Cowboy were men who took care of cows and other cattle. The cattle were in the West and in Texas. People in the cities of the East wanted beef these cattle. Trains could take the cattle east. But first the cattle had to get to the trains. Part of the cowboy’s job was to take the cattle hundreds of miles to the railroad town. The trips were called cattle drivers. A cattle drive usually took several months. Cowboys rode for sixteen hours a day. Because they rode so much, each cowboy brought along about eight horses. A cowboy changed horses several times each day.

The cowboys had to make sure that cattle arrived safely. Before starting on a drive, the cowboys branded the cattle. They burned a mark on the cattle to show who they belonged to. But these marks didn’t stop rustlers, or cattle thieves. Cowboys had to protect the cattle from rustlers. Rustlers made the dangerous trip even more dangerous.

Even though their work was very difficult and dangerous, cowboys did not earn much money. They were paid badly. Yet cowboys liked their way of life. They lived in a wild and open country. They lived a life of adventure and freedom.

11. A cowboy is a symbol of .

A. courage and adventure B. a hard life and big pay

C. movies in the past D. cows and other cattle

12. The cowboys’ job was .

A. to be a hero in real life B. to be a hero of the movie

C. to take care of cattle D. to be a dangerous rustler

13. During a cattle driver, cowboys took a group of cows from a wild and open country to .

A. the West states and Texas B. the cities of the East States

C. the people who eat beef in cities D. the railroad towns hundred miles away

14. On their way of cattle drivers, the cowboys protected the cattle by .

A. burning a mark on their cows B. keeping an eye on cattle thieves

C. making the trip more dangerous D. looking after eight cows each person

15. Cowboys enjoyed themselves because .

A. they liked their way of life B. they made a lot of money

C. they had a vary difficult job D. they were heroes in movies

简述建筑电气安装工程中的预检主要内容是什么?

Let children learn to judge their own work. A child learning to talk does not learn by being corrected all the time; if corrected too much, he will stop talking. He notices a thousand times a day the difference between the languages he uses and the language those around him use. Bit by bit, he makes the necessary changes to make his language like other people. In the same way, when children learn to do all the other things they learn to do without being taught-to walk, run, climb, whistle, ride a bicycle-compare those performances with those of more skilled people, and slowly make the needed changes. But in school we never give a child a chance to find out his own mistakes for himself, let alone correct them. We do it all for him. We act as if we thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was made to. Soon he becomes dependent on the teacher. Let him do it himself. Let him work out, with the help of other children if he wants it, what this word says, what answer is to that problem, whether this is a good way of saying or doing this or not.

If it is a matter of right answers, as it may be in mathematics or science, give him the answer book. Let him correct his own papers. Why should we teachers waste time on such routine work? Our job should be to help the child when he tells us that he can’t find the way to get the right answer. Let’s end this nonsense of grades, exams, marks, Let us throw them all out, and let the children learn what all educated persons must some day learn, how to measure their own understanding, how to know what they know or do not know.

Let them get on with this job in the way that seems sensible to them. With our help as school teachers if they ask for it. The idea that there is a body of knowledge to be learnt at school and used for the rest of one’s life is nonsense in a world as complicated and rapidly changing as ours. Anxious parents and teachers say, “But suppose they fail to learn something essential they will need to get in the world?” Don’t worry! If it is essential, they will go out into the world and learn it.

1.What does the author think is the best way for children to learn things?

A.by copying what other people do.

B.by making mistakes and having them corrected.

C.by listening to explanations from skilled people.

D.by asking a great many questions.

2.What does the author think teachers do which they should not do?

A.They give children correct answers.

B.They point out children’s mistakes to them.

C.They allow children to mark their own work.

D.They encourage children to mark to copy from one another.

3.The passage suggests that learning to speak and learning to ride a bicycle are___.

A.not really important skills.

B.more important than other skills.

C.basically different from learning adult skills.

D.basically the same as learning other skills.

4.Exams, grades, and marks should be abolished because children’s progress should only be estimated by___.

A.educated persons.

B.the children themselves.

C.teachers.

D.parents.

5.The author fears that children will grow up into adults while being___.

A.too independent of others.

B.too critical of themselves.

C.incapable to think for themselves.

D.incapable to use basic skills.