题目

工业上利用CO和水蒸气在一定条件下发生反应制取氢气：CO(g)＋H2O(g) CO2(g)＋H2(g)△H＝－41 kJ/mol某小组研究在相同温度下该反应过程中的能量变化。他们分别在体积均为VL的两个恒温恒容密闭容器中加入一定量的反应物，使其在相同温度下发生反应。相关数据如下： 容器编号起始时各物质物质的量/mol达到平衡的时间/min达平衡时体系能量的变化/kJ COH2OCO2H2 ①1400t1放出热量：32.8 kJ ②2800t2放出热量：Q（1）该反应过程中，反应物分子化学键断裂时所吸收的阅读理解     One-room schools are part of the United States, and the mention of them makes people feel a vague longing for "the way things were".      One－room schools are an endangered species, however.Formore than a hundred years one－room schools have been systematically shut down and their students sent away to centralized schools.As recently as 1930 there were 149,000 one－room schools in the United States.By 1970, there were 1,800.Today, of the nearly 800 remaining one－room schools, more than 350 are in Nebraska.The rest are scattered through a few other states that have on their road maps wide－spaces between towns.     Now that there are hardly any left, educators are beginning to think that maybe there is something yet to be learned from one－room schools, something that served the pioneers that might serve as well as today.      Progressive educators have come up with progressive－sounding names like "peer－group teaching" and "multi－age grouping" for educational procedures that occur naturally in the one－room schools.In one－room schools, the children teach each other because the teacher is busy part of the time teaching someone else.A fourth grader can work at a fifth－grade level in math and a third－grade level in English without the shame associated with being left back or the pressures of being skipped ahead.A youngster with a learning disability can find his or her own level without being separated from the other pupils.In larger urban schools today, this is called "mainstreaming". A few hours in a small school that has only one classroom and it becomes clear why so many parents feel it one of the advantages of living in Nebraska that their children have to go to a one－room school.1. According to the text, many educators today feel that one－room schools________.A. need to be shut down   B. are the best in NebraskaC. are still common in America  D. provide good education2. One－room schools are in danger of disappearing because________.A. they all exist in only one stateB. they skip too many children aheadC. there is a trend toward centralizationD. there is no fourth－grade level in them3. What is mentioned as a major characteristic of the one－room school?A. Some children have to be left back.B. Teachers are always busy.C. Pupils have more subjects to study.D. Leaning is at different grade levels at a time.4. What's the author's attitude toward one－room schools?A. He prises them.  B. He dislikes them.C. He shows sympathy.  D. He rejects them.5. The last sentence suggests that parents living in Nebraska________.A. don't like centralized schoolsB. once studied in one－room schoolsC. prefer rural life to urban oneD. came from other states of America