题目

请按照要求写出下列反应的化学方程式： (1)铁和硫酸铜溶液反应(即：湿法制铜)________________________________________；(2)酒精燃烧： ________________________________________； 答案：【答案】 【解析】本题是有关化学方程式的书写。（1）铁比铜活泼，铁能把铜从其盐溶液中置换出来，铁和硫酸铜反应生成硫酸亚铁和铜，方程式为。（2）酒精燃烧是酒精与氧气反应生成二氧化碳和水，方程式为。10．One day，I saw three teenage girls were walking up the street together，（16）Cthey didn't seem together at all．（17）Cthey walked side by side，they weren't（18）Dto each other．They weren't laughing together．（19）Beach girl's eyes rested firmly on their hands outstretched in front of them（20）Din each girl's palm was a cellphone．I am not（21）Awhy they weren't talking to each other．With today's（22）Ait is hard to tell．Still，it made me shake my head to（23）Dthat something as small as a cellphone could put so much（24）Cbetween girls who were so close together．    Since the beginning of time，ideas and（25）Ahave flowed into the minds of  people，and people have used these ideas and inventions to both help and（26）Dthemselves．The person who first cast （浇铸）metal saw his idea turned into plowshares（犁刀）that helped（27）Bthousands and swords that killed thousands more．Nobel saw his invention of dynamite used to（28）Capart mountains，to build roads for the（29）Aof everyone．He also saw it used to blow apart bodies and end（30）Dlives in war．Albert Einstein saw the（31）Dof his genius used to create abundant power that helps millions of people every day．He saw（32）Bit used to build bombs that could kill us all a hundred times over．   Every invention and every piece of technology can be used to help us grow better and（33）Dtogether or it can be used to distance us and destroy us．The（34）Ais in how we use it．The key I feel is love．If there is someone right beside you who needs your love，don't be（35）Cto turn off the electronics，look them in the eye，and give them a hug．16．A．orB．andC．butD．so17．A．If onlyB．As thoughC．Even thoughD．Only if18．A．pointingB．comingC．approachingD．talking19．A．BesidesB．InsteadC．ThenD．Anyway20．A．whenB．whileC．althoughD．because21．A．sureB．doubtfulC．confidentD．anxious22．A．technologyB．situationC．lifestyleD．options23．A．wonderB．thinkC．understandD．realize24．A．effortB．relationC．distanceD．fun25．A．inventionsB．opinionsC．practiceD．information26．A．stopB．blindC．controlD．hurt27．A．settleB．feedC．saveD．maintain28．A．pullB．tearC．blowD．cut29．A．benefitB．goalC．dreamD．direction30．A．homelessB．fearlessC．carelessD．countless31．A．ideaB．advantageC．seedD．fruit32．A．for sureB．as wellC．once againD．in time33．A．quickerB．higherC．longerD．closer34．A．choiceB．resultC．processD．hope35．A．passiveB．sorryC．afraidD．angry