题目

金属材料的研究和应用是化学学习的一个重要内容。 （1） 可将铝块制成铝箔是利用了金属铝具有的什么性质？ （2） 生铁和钢都是铁的合金，为什么它们在性能上有很大差异？ （3） 为什么工业上可用稀盐酸除去铁锈？（用化学方程式表示）。 答案：延展性 含碳量不同，导致性能有很大差异 【1】Fe2O3+6HCl=2FeCl3+3H2O The Khao San Road woke early. At five, car horns began sounding off in the street outside. Then the water pipes under the floor started to rattle as the guest-house staff took their showers. I even could hear their conversations.Lying on my bed, listening to the morning noises, the tension of the previous night became unreal and distant. Although I couldn't understand what the staff were saying to each other, their occasional laughter conveyed a sense of normality: they were doing what they did every morning, their thoughts connected only to routine. I imagined they might be discussing who would go for kitchen supplies in the market that day or who would be sweeping the halls.Around five-thirty a few bedroom-door bolts clicked open as the early-bird travellers emerged and the die-hard party goers from Patpong returned. I realised that the dreamless snatches of sleep I’d managed were finished, so I decided to get up and have breakfast.There were already a few travellers at the tables, drinking glasses of black coffee. I began studying the menu, a once white sheet of A4 paper with such an excessive list of dishes I felt making a choice was beyond my ability. Then I was distracted by a delicious smell. A kitchen boy had wandered over with a tray of fruit pancakes. He distributed them to a group of Americans, cutting off a good-natured argument about train times to Ciang Mai.One of them noticed me eyeing their food and he pointed at his plate. ‘Banana pancakes,’ he said. ‘The business.’I nodded. They smell pretty good.，‘Taste better. English?’‘Uh，huh.，‘Been here long?’'Since yesterday evening. You?”“A week’, he replied, and popped a piece of pancake in his mouth, looking away as he did so. I guessed that signaled the end of the exchange.The kitchen boy came over to my table and stood there, gazing at me expectantly through sleepy eyes."One banana pancake, please,' I said, obliged into making a quick decision.‘You wan’ order one banan’ pancake?’‘Please.’‘You wan’ order drink?’‘Uh, a Coke. No, a Sprite’‘You wan’ one banan’ pancake, one Spri.’“Please.”He walked back towards the kitchen, and a sudden feeling of happiness washed over me.【1】The writer described the morning noises in order to__________.A.imply that he didn’t sleep wellB.predict the morning would be differentC.compare the city's morning and nightD.show what a terrible dream he had【2】According to the writer, what were the staff talking about?A.Their daily work.B.Their strange guests.C.Their normal supplies.D.Their night experience.【3】The American let the writer know that he wouldn’t like to go on with the conversation by__________A.asking the writer about the pancakeB.telling the writer what he likedC.stopping looking at the writerD.commenting on the pancake【4】By the end of the passage, the writer felt he had recovered from __________.A.the depressionB.the nervousnessC.the injuryD.the tiredness