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Tom sent me____ e-mail last night.A a B an C the 选哪一个 last night i sent some emails to my frieds.变为同义句 He sent an e-mail to me last week.转换为An e-mail— — —me last weekYou should water the flowers every day.转换The flowers— — every day how did kids spend the weekend 怎么读的 Ted said he saw UFO and alien that night.A.an,an B.a,a C.an,a D.a,an 讲下原因Ted said he saw UFO and alien that night.A.an,an B.a,a C.an,a D.a,an An alien got out of the UFO为什么用the UFO与它的全称前面是加 an还是a?UFO前面加a。那unidentified flying object按照发音特点。是加an么？ UFO前应该用an还是a 好像都有道理说明原因 legend of mermaidlegend of mermaid? ls there a cat behind the curtains 改为肯定句是什么? Is there a cat behind the curtains答句 is there a cat behind the curtains 答句 -Have you received my ________?-Yes.It reached me only twodays ago.A.answer letterB.answering letterC.reply letterD.letter in reply Have you received an e-mail message from Helen?----____________Really?no news is good newsA.YES,I have.B No,I haven't You have new mail!我在完型中看到这句话.mail不是可数名词吗?为什么这里you have new mail没有冠词 mail也没变复数? -Do you have msn?-Of course I have!Do you find I have added you My new mail is:这样回答是不是显得很没有礼貌?怎么中国式了呢？请你帮我改改！ 为什么佛教有万字而纳谇也是万字旗有什么联系 一袋氧气能吸多久 关于there is/there isn‘t和there are/there aren’t发音的区别我现在准备把听力好好搞一搞,在听北外的“中级英语听力”,我发现我很难听出来上述几个连读的情况,另外of基本听不出来,还有won't经常 地球上的氧气能够我们吸多久的?每人每天都吸入太多的氧气了! 用There is（isn't） 或 There are （aren't）填空A:Wow,we have so many things for dinner._____ any meat?B:Yes,_____._____ some chicken ,pork and beef,but _____ any fish.A:Good._____ any vegetables?B:Yes,_____ ._____ some potatoes,tomatoes and c 请用There is/are,There isn't/aren't,There was/were,There wasn't/were't.写出深南大道的变化用英语！ Please keep your eyes ______ (close \to close \closed) 选哪个? please keep your eyes closed.为什么要用closed.而不用close 如何理解,硫与变价金属反应生成低价金属硫化物,为什么会这样. 我知道硫和变价金属反应生成低价的金属硫化物,像与铁反应生成硫化亚铁,为什么与汞反应生成的是硫化汞却不是硫化亚汞呢?谢啦! 当化合物中含有低价的金属元素时……当化合物中含有低价的金属元素时,在命名时应在金属元素名称前加一“______”字,如“FeCl2”应读作______ Is your brother going to () to American?A visit,B arrive,C travel ,D meet be nice to american or we'll bring democracy to your country请教这句话怎么翻译 2.A terrible earthquake happened in that district at the end of 2004,_____many countries in .2.A terrible earthquake happened in that district at the end of 2004,_____many countries in the world paid close attention to it.A.that B.which C.when D.wher It’s been over two years ____a terrible earthquake happened in Wenchuan. a terrible earthquake happened in Japan _____ March.A.to B.on C.in D.at