如图已知椭圆c1的中心在原点,焦点x轴上，离心率e=二分之根二，F是右焦点，A是右顶点，B是椭圆上一

(1/2)2008年用英语表达为(year of)two thousand and eight,townty 0 eight是否都正确,还有其他 The major problem with E-mail is that it is __(71)__ easy to use that people canbecome __(72)__ with messages.__(73)__ they can possibly answer in a day.In addition,mail boxes require some management to __(74)__ messages or archive those that might b Now that we've discussed our problem,are people happy with the decision……?A.taking.B.takeC.taken.D.to take应选哪个, 与a thousand year风格相似的英文歌 Now that we’ve discussed our problem,are people happy with the decisions ________?3QA.taking B.take C.taken D.to take What do people use water to do at work?回答(给多点回答),谢 怎么用英语怎么说‘在第九中学“这个介词短语 1.People are leaving work and are going home.疑问：and后面的那个are不是一样省略的吗、同一个句子里用and连接be动词不需要重复吧?为什么书上还印上去?who is sleeping in the room?为什么在这句话后面我们 People are leaving work and are going home.这里是用and连接的,and后面的are不是应该省略的吗?为何书 英语翻译 the last half of the nineteenth century ____ the improvement in the means of travela.has witnessedb.witnessed为什么选b不选a 为什么不可以用现在完成时 49.In the southwestern part of the United States ________ built in the last century.A) they are many abandoned mining towns B) where there are many abandoned mining townsC) are many abandoned mining towns D) many abandoned mining towns are为什么 The last half of the nineteenth century __the steady improvement in the means of travel.A .has witnessed B.was witnessed C.witnessed D.is witnessed 请问The olympics is held _______four years.中的空格应选择each还是every?为什么呢 their birthdays only come _____ four years是填each,every还是once the Olympic games are held___(each/every)four years答案是EVERY 问一下为什么不能用EACH how often is the Olymic Games held?是each four years 还是 every four years呢 为什么呢? 当某人回答说It cost me 300 dollars.那前面的问句咋说? 翻译people bring the well water up to the ground and then dry it up in big jars over fire意思 people can use it to change the water into the air Two people were burned to_____(死)in the fire 雪用英语怎么写 白雪用英文怎么写 英语白雪怎么写 酷雪 英文怎么写?怎么拼? The World Expo 2010 will open on May 1 and end on October 31.(保持原句意思)The World Expo 2010 will____ ____from May 1 and end on October 31. Could you help me with the math problem?Sorry,it's hard for me ,too.Ask Jim,he ( ).A.may know B.may be know 答案为什么选A Would you please help me with my English?sorry,_my English is not good,either.A.SO B.and C.or D.but 选神魔啊 The juice cost her five dollars还是The juice costs her five dollars Five thousand dollars ______ by these people.A、 has been wasted B、 hae been wasted C、 have waster D、has wasted I'm litter water drop （litter water drop画线）对划线部分提问 电视广告If we don't save water ,the last drop of water will be our tear-drop.根据提示,写一篇作文提示；1.生活离不开水 2.可饮用水在减少 3.水污染严重 4.应保护水源.再利用水