题目

 (1)光年是天文学中的距离单位，1光年大约是9500 000 000 000km，这个数据用科学记数法表示是                   km； (2) 1.4149≈                     （精确到百分位）. 答案：；How the iron of tomorrow （the first Self Clean Iron） can change your lifestyle today？ General Electric introduces the iron of tomorrow．The iron can clean itself．Inside where irons get dirty．Because it cleans itself each and every time you empty it． How？ With a push of a magic blue button． The magic blue button The first thing you'll notice that's different about this iron is the blue button on the side．It's marked “Self Clean”．Push this blue button，and you can wash out loose mineral deposits（沉淀物）that remain and block up inside．Push this button，and you've made life a lot easier． Less chance of brown spots Sure，Self Cleaning Iron is going to cut down on brown spots．（Those ugly spots that happen on nice，cleanly pressed clothes．） Because a Self Cleaning Iron becomes clean each time you press that magic blue button． Steams better longer Common sense tells you that if you've an iron that blocks less often it has to stay younger for a long period of time．In other words，it steams better longer．That's another joy of owning General Electric's Self Cleaning Iron． What does it mean to you Today you are doing so much more than just running a house and running after the kids．You're working．You're going to school．It's all part of your lifestyle．The iron can change that lifestyle．By giving you less trouble before you iron．If we can make it easier for you to be a better wife，a better mother，a better housemaker，we want to．The new Self Cleaning Iron is another one of Home-Makers from General Electric． Lifestyle． We're with yours． GENERAL ELECTRIC 1．This passage is________． A．an introduction to General Electric B．an operating instruction of Self Cleaning Iron C．an advertisement of Self Cleaning Iron D．a description of the change of lifestyle 2．This iron can clean itself by________． A．emptying itself B．washing out mineral deposits C．blocking up mineral deposits D．giving off more steam 3．According to the passage，what is most likely to attract the customers？ A．It is made by General Electric． B．The iron will not produce mineral deposits． C．There will be fewer brown spots on pressed clothes． D．It is cheap．