题目

运用化学反应原理研究碳、氮、硫的单质及其化合物的反应对缓解环境污染、能源危机具有重要意义。 I.氨为重要的化工原料，有广泛用途。 (1)合成氨中的氢气可由下列反应制取： a. CH4(g)+H2O(g)⇌CO(g)+3H2(g)  ∆H1=+216.4kJ/mol b. CO(g)+H2O(g)⇌CO2(g)+H2(g)   ∆H2=-41.2kJ/mol 则反应CH4(g)+2H2O(g)⇌CO2(g)+4H2(g)   ∆H= _____________。 (2)起始时投入氮气和氢气的物质的量分别为1mol、3mol，在不同温度和压强下合成氨。平衡时混合物中氨的体积分数与温度的关系如图。 ①恒The doctor check Nuala's leg .Nuala tried not to cry, but it was difficult. Her leg really hurt."How did you hurt yourself?"asked the doctor:I jumped off a swing（秋干），” said Nuala．“Is it broke？”“It sure is, "said the doctor, holding out the X-ray. "See right here.Two hours later, Nuaia left the hospital on crutches(腋仗). Her leg was in a cast（石膏夹）" What will I tell Ms, Chang?"she asked her mother in the car.Mr Chang was Nuala's dance teacher. The spring dance performance(表演)was only two weeks away. Nualas cast would be on for at least six weeks!'She is going to be crazy about me!"said Nuala. But Ms Chang wasn’t crazy. She said, "We'll think of something.Nuala felt ridiculous going on stage with her crutches. I look stupid, " she said, "I’m afraid I can't dance with them.“Have you ever heard"The show must go on?asked Ms Chang. Then together, they thought about the show carefully. They thought of ways for her to dance on crutches .On the night of the performance, Nuala told herself to relax again and again. Nuala'scast looked quite big and heavy, but she went out and danced In the end, the audience（_____）cheered. Someone even threw roses at the stage! The show did go on!根据材料内容选择最佳答案，并将其标号填涂在答题卡相应的位置上。1.How did Nuala hurt her legA. She ran too hard B. She fell off a bikeC. She danced too hard D. She jumped off a swing2.Nuala broke her leg before the spring dance performance.A. one week B. two weeks C. three weeks D. four weeks3.What does the underlined word "ridiculous “mean in Chinese?A. 抱歉的 B. 激动的 C. 安全的 D. 滑稻的4.What did the audience think of Nualas performance?A. Boring B. Common C. Expensive. D. Successful5.What lesson can we learn from the storA. Teaching is hard.B. Everything is possible.C. Don't try to do two things at a time.D. Helping others is helping ourselves