4．若，A=，其中a,b、G、H的大小关系是

A．A≤G≤H　　　 B．A≤H≤G　　 C．H≤G≤A　　 D．G≤H≤A

3．如果且，那么以下不等式正确的个数是

①　　 ②　　 ③　　 ④　　 ⑤

A．2　　 　　B．3　　 　　　C．4　　　 　　　D．5

2．设a、b、c是互不相等的正数，则下列等式中不恒成立的是

A．　　B．

C．　　　D．

1．设，已知命题；命题，则是成立的

A．必要不充分条件　 B．充分不必要条件C．充分必要条件　 D．既不充分也不必要条件

3．指数函数在底数及这两种情况下的图象和性质：

图象
性质	(1)定义域：
(2)值域：
(3)过点，即时
(4)在上是增函数	(4)在上是减函数

　 例3．已知指数函数的图象经过点，求的值(教材第66页例6)。

　 例4．比较下列各题中两个值的大小：

　 ；　　　　　 　　　　　　

(教材第66页例7)

小结：学习了指数函数的概念及图象和性质；

练习：教材第68页练习1、3题。

作业：教材第69页习题2。1A组题　 第6、7、8题　

2.指数函数(且)的图象：

例1．画的图象(图(1))．

解：列出的对应表，用描点法画出图象

	…	-3	-2	-1.5	-1	-0.5	0	0.5	1	1.5	2	3	…
	…	0.13	0.25	0.35	0.5	0.71	1	1.4	2	2.8	4	8	…

例2．画的图象(图(1))．

	…	-3	-2	-1.5	-1	-0.5	0	0.5	1	1.5	2	3	…
	…	8	4	2.8	2	1.4	1	0.71	0.5	0.35	0.25	0.13	…

指出函数与图象间的关系？

说明：一般地， 函数与的图象关于轴对称。

1．指数函数定义：

一般地，函数(且)叫做指数函数，其中是自变量，函数定义域是．

练习：判断下列函数是否为指数函数。

①　 ②　　　 ③(且)④

⑤　 ⑥　　 ⑦ ⑧．

引例1：某种细胞分裂时，由1个分裂成2个，2个分裂成4个……1个这样的细胞分裂次后，得到的细胞个数与的函数关系式是：．

这个函数便是我们将要研究的指数函数，其中自变量作为指数，而底数2是一个大于0且不等于1的常量。

201. It's a great pleasure to...……(感到)非常愉快. It's a great pleasure to do business with you. 跟你做生意我感到非常愉快. 202. It's customary to...…是习惯. It's customary to give people gifts on their birthday. 过生日送礼物是一种习俗. 203. It's delightful to...……令人很高兴. lt's delightful to play by the seashore. 在海滨玩令人很高兴. 204.lt's my great honor to...……是我莫大的荣幸. It's my great honor to introduce the governor. 我很荣幸向大家介绍我们的州长. 205. It's (not) good to...……(不)好. It's not good to get into the habit of telling lies. 养成说谎的习惯不好. 206. It's our duty to... ……是我们的责任. It's our duty to protect the forests from destruction. 保护森林免遭破坏是我们的责任. 207. It's wrong to...……是不对的. It's wrong to read people's private letters without permission.未经允许看别人的私人信件是不对的. 208. It's a shame / pity that... 可惜/遗憾……. It's a shame that you cannot make it to the party tonight. 今晚你不能来参加聚会,真可惜. 209. It is (really) unbelievable that...……(真)让人难以置信. It's really unbelievable that such an honest fellow should have betrayed his friends! 这样一个老实人竟会出卖朋友,真让人难以置信1 210. It is /will be difficult to...……(会)很难. I think it will be difficult to tell her the truth. 我认为告诉她真相会很难. 211. It'll do you good to...……对你有好处. I think it'll do you good to drink eight glasses of water every day. 我认为每天喝八杯水对你有好处. 212. Last but not least, ...…最后但同样重要的是……. Last but not least, I'd love to thank all my teachers and friends. 最后但同样重要的是,我要感谢我所有的老师和朋友. [经典演讲句型] 213. Let me explain why...…让我解释为什么……. Let me explain why I didn't do my homework. 让我解释为什么我没做家庭作业. 214. Let me fill you in on... 让我来告诉你……. [六星级句型] Let me fill you in on the company's new policies. 让我来告诉你公司的新政策. [ fill sb. in on: 对某人提供有关……的情况] 215. (Just) let me know if... 如果……,请告诉我. 1) Let me know if you change your mind. 如果你改变了主意,请告诉我. 2) Just let me know if you don't know how to get to that shop. I will be glad to take you there. 如果你不知道怎么去那家店,请告诉我.我很乐意带你去那的. 216. Let me see if... 让我看看是否……. Let me see if I can be of any help. 让我看看能否帮上什么忙. 217. Make sure to do sth.-定要做某事. Make sure to leave a note if you go out. 你出去的话一定要留个条. 218. Maybe it's better to... 可能……会更好一些. Maybe it's better to stay at the hospital for another few days.你在医院再住几天可能会更好一些. 219. ... means a great deal to me.……对我意义重大. Your encouragement means a great deal to me. 你的鼓励对我来说意义重大. 220. My dream / goal / hope / plan is... 我的梦想/目标/希望所划是……. My dream is to speak English in three months. 我的梦想是三个月内会说英语. 221. My point of view is that... 我的观点是……. My point of view is that everybody should have the right to get an education. 我的观点是每个人都应该有权利接受教育. 222. no matter what... …无论什么……. No matter what happens, I'll always stand by you. 不论发生什么事,我都永远支持你. 223. no one can deny that... 没有人能够否认……. No one can deny that the accident was caused by carelessness. 没有人能够否认这起事故是由粗心造成的. 224. no sooner...than... 一……就……. [倒装句型] No sooner had he closed his eyes than he fell asleep. 他一合眼就睡着了. 225. no words can express... 语言难以表达……./……难以言表. No words can express how surprised and happy I was when I saw the gift. 语言难以表达当我看到那份礼物时有多么的惊喜. 226. Not until...did... 直到……才……. [倒装句型] Not until I began to work did I realize how much time I had wasted. 直到我开始工作,我才意识到我已蹉跎了很多岁月. 227. Now that...,…既然/由于……,……. Now that we are alone, we can talk freely. 既然我们单独在一起,就无拘束地聊聊吧. 228. On the condition that... …条件是……. You can leave school early, on the condition that you finish your assignment first. 你可以早点离校,条件是你得先做完作业. 229. On the contrary, ... 正好相反,……. Their criticism did not discourage me. On the contrary, I worked even harder. 他们的批评并没有使我感到气馁,相反,我比以前更加努力了. 230. On (the) one hand..., on the other (hand), ... 一方面……,另一方面……. On (the) one hand I admire your ability, but on the other (hand) I distrust your judgment. 一方面我钦佩你的才能,但另一方面我不相信你的判断力. 231. One of the +形容词最高级+名词+is… 最……之一的就是…… One of the most impressive pieces of writing is Hamlet. 给人印象最深的著作之一就是《哈姆雷特》. 232. Personally, I think / believe / feel... 我个人认为/相信/感觉……. Personally, I think that women play an increasingly important role in society now. 我个人认为女性在社会中发挥着越来越重要的作用. ; 233. Please don't hesitate to... 请随时……. Please don't hesitate to contact us if you are in need of assistance. 如果你需要协助,请随时联系我们. 234. Please feel free to... …请随时……. Please feel free to visit me when you are in Guangzhou. 在广州的时候,请随时来找我. 235. Please forgive me for... …请原谅我……. Please forgive me for being late. 请原谅我来晚了. 236. Please give my best wishes to...…请代我问候……. Please give my best wishes to your parents. 请代我问候你的父母. 237. Recent studies show that... 最近研究表明……. Recent studies show that an increasing number of students go abroad at an early age. 最近调查表明,越来越多的学生在年纪尚小的时候就出国留学了. 238. Sb. can do nothing but do... 除了做……,某人什么也做不了. Their neighbors tan do nothing but envy their new pool. 他们的邻居只能羡慕他们的新泳池. 239. Sb. have / has / had no choice but to do... 某人除了做……别无选择. We had no choice but to take a taxi for we'd missed the last bus. 由于错过了最后一班公共汽车,除了乘坐的士,我们别无选择. 240. Sb. look(s) as if... 某人看上去好像……. She looks as if she is unfriendly at first. 她起初看上去好像一点都不友好. 241. Something must be done to...…必须采取措施……. Something must be done to change our current examination system. 必须采取措施来改革我们现行的考试制度. 242. Sorry to bother you, but... …很抱歉打扰你,可是……. Sorry to bother you, but I have a question to ask you. 很抱歉打扰你,可是我有个问题要问你. 243. Thanks to... 由于…/多亏…. Thanks to his parents' encouragement and support, he finally realized his dream. 多亏了他父母的鼓励与支持,他终于实现了他的梦想. 244. The point is... 重点/关键是……. The point is that you have to keep your promise to help her with her English. 关键是你得遵守诺言,帮她学习英语. 245. The problem / question is that / whether... 问题是……. 1) The problem now is that we're locked out of the house. 现在的问题是我们被锁在门外了. 2) The question is whether they will be able to help us. 问题是他们能否帮助我们. 246. The reason why... is...…的原因就是……. The reason why he made such a great achievement is his perseverance. 他之所以取得如此伟大的成就,原因是他坚持不懈. [ perseverance n.坚持;坚定不移] [坚持创造辉煌!] 247. The secret of...is to... ...的秘诀是....... The secret of success is to do the common things uncommonly well. 成功的秘诀是将平凡的事做得不平凡. [五星级名言!李阳老师热烈推荐!] 248. The way I see it, ..…我的看法是……. The way I see it, you should avoid making the same mistake again. 我的看法是你应该避免再犯同样的错误. 249. This was the moment when...…就是那个时候……. This was the moment when I realized that I wanted to be a professional singer. 就是那时我意识到自己想成为一名专业歌手. 250. That reminds me, ... 那提醒了我……./那让我想起了……. That reminds me, I must get some cash. 这倒提醒了我,我得取一些现金

101. I won't...unless... 除非……否则我不会……. I won't write to him unless he writes to me first. 我不会写信给他的,除非他先写给我. 102. I used to... 我过去常常……. I used to go play basketball with some of my friends every Saturday afternoon. 以前我和一些朋友每星期六下午都去打篮球. 103. I would advise you to... 我会建议你……. I would advise you to get up earlier on Mondays, because there's always a traffic jam. 我会建议你星期一早上早点起床,因为总是会塞车. 104. I would appreciate it if... 如果……,我会非常感激. I would appreciate it if you call me back this evening. 如果你晚上给我回电话,我会非常感激. 105. I would like to recommend... 我想推荐……. I would like to recommend the Vietnamese cuisine in that restaurant. 我想推荐一下那家餐厅的越南菜. [cuisine n. 烹饪;烹调风格] 106. I would like to... rather than... 我宁愿……也不……. I would like to take a walk rather than watch TV this weekend. 这周末我宁愿散步也不想看电视. 107. I would rather...than... 我宁愿……,而不愿……. I would rather stay at home than go shopping on such humid day. 在这样潮湿的天气里,我宁愿呆在家里,也不愿去购物. 108. I wouldn't feel happy if... 如果……我会不高兴的. I wouldn't feel happy if you didn't come to my birthday party. 如果你不来我的生日聚合的话,我会不高兴的. 109. I'd be happy to..., if you'd like. 如果你愿意,我很高兴……. I'd be happy to show you around, if you'd like. 如果你愿意,我很高兴带你四处看看. 110. I'd like to know more about... 我想了解更多关于……. I'd like to know more about the project you are carrying out. 我想更多地了解你们正在进行的项目. 111. I'd like to suggest you do... 我想建议你……. I'd like to suggest you take the test when you are still in school. 我想建议你在上学的时候就参加这个考试. 112. I'd like /love to, but... 我很想,但……. I'd love to, but I'm afraid I'm otherwise engaged. 我很想,但恐怕我已经另有安排了. [ 拒绝别人邀请的经典句型.] 113. I'm (not) certain... 我(不)确定……. I'm certain that you will get over your laziness. 我确信你会克服你的惰性的. [没有什么是不能克服的,只要有决心] 114. I'm afraid I won't be able to... 恐怕我不能……. I'm afraid I won't be able to finish the task before Friday. 恐怕我无法在星期五之前完成这项任务. 115. I'm busy with (doing)... 我正忙于……. Don't bother me - I'm busy with (doing) my project right now. 别打扰我,我现在正忙于作计划呢. 116. I'm considering (doing)... 我正考虑……. I'm considering buying a second-hand computer for I'm short of money now. 因为现在钱不够,我正考虑买台二手电脑. 117. I'm convinced that... 我确信……. I'm convinced that what you said is quite right. 我相信你所说的相当正确. 118. I'm curious to (do)/about... 我对(做)……很好奇. I'm curious to know what was happening outside. 我很好奇,想知道外面发生了什么事. 119. I'm determined to...我决定……. I'm determined to read 10 books this month. 这个月我决定读十本书. 120. I'm getting a little concerned about... 我对……有点担忧. I'm getting a little concerned about the results of my TOEFL test. 我对我的托福考试成绩有点担忧. [TOEFL = Test of English as a Foreign Language英语作为外国语的考试(也称托福考试)(美国大学对外国学生入学前的英语测试)] 121. I'm interested in...我对……感兴趣. I'm interested in joining the English corner. 我有兴趣参加英语角. 122. I'm (just) calling to... 我打电话来是要……. I am (just) calling to confirm my flight number. 我打电话来是要确认我的航班号. 123. I'm (not) sure... 我(不是)很确定……. I'm not sure if I should accept that job offer in Hong Kong. 我不确定我是否应该接受香港的那份工作. 124. I'm not very interested in... 我对……不是很感兴趣. I'm not very interested in listening to classical music. 我对听古典音乐不是很感兴趣. 125. I'm occupied (with)... 我忙于……. I'm occupied with preparing for the final exams; don't bother me! 我正忙着准备期末考试,别来打扰我1 126. I'm really fond of... 我的确喜欢……. I'm really fond of surfing the Internet; it is pretty convenient. 我的确喜欢上网,上网真的很方便. 127. I'm really / terribly / extremely sorry for... 我对……感到非常抱歉. I'm really sorry for the delay of the report. 报告延误上交,我对此感到非常抱歉. I28. I've been thinking about... 我一直想……. I've been thinking about going to France to study art. 我一直想去法国学艺术. 129. I have a desire to... 我非常渴望……. I have a strong desire to speak good English. 我非常渴望说一口流利的英语. 130. I've decided to... 我已经决定……. I've decided to run for the monitor of our class. 我已经决定竞选班长了. [run for:竞选] [疯狂提醒] 接下来的四个句型都是虚拟语气句型,请疯狂操练,坚决攻克这一难点. 131. If I did..., I would... 如果我……,我会……. If I knew his number, I would phone him. 如果我知道他的电话号码,我会打电话给他的. 132. If I had done..., I would have done... 如果我……,我就会……. If I had known that you were coming, I would have met you at the airport. 如果我知道你要来,我就会去机场接你了. 133. If I were you... I would... 如果我是你……,我就会……. If I were you, I would get rid of this bad habit. 如果我是你,我就会改掉这个坏习惯. 134. If only...! 真希望……!若是……那该多好啊! If only she would accept my invitation! 要是她接受我的邀请该多好啊1 135. If it is possible, ... 可能的话……. 1) If it is possible, I'd like to see you tomorrow. 若可能,我想明天见你. 2) If it is possible, lend me your car tonight. 若可能,今晚把你的车借给我. 136. If you ask me, I think... 如果你问我,我认为……. If you ask me, I think you should practice more. 如果你问我,我认为你应该多加练习. 137. If you want to..., you'll have to... 如果你想……,你将不得不……. If you want to remember more words, you'll have to read a lot in English. 你要是想记住更多的单词,你就得大量地读英语. 138. In a word... 总之,… In a word, money is something but not everything. 总之,金钱很重要,但它不是万能的. 139. In brief/short, ...,简言之,……. 1) In brief, we cannot please everyone all the time. 简而言之,我们无法总是让每个人都满意. 2) In short, science frees us from the bondage of nature. It has made our lives easier and more comfortable.总之,科学把我们从自然的束缚中解脱出来,使我们生活得更加轻松舒适. [bondage n.束缚;奴役] 140. In conclusion, ...最后,…….聪之,……. In conclusion, I find mutual understanding plays a key role in building a friendly relationship. 总之,我发现相互理解对建立友好关系至关重要. 141. In general, ... --般而言,……. In general, graduates who speak good English will have more chances than those who don't. 一般而言,会讲流利英语的毕业生比英语不好的毕业生机会更多. 142. In my opinion /view, ... 我认为……. In my opinion, we should never abandon hope for success. 我认为我们永远都不应该放弃对成功的希望. [abandon..放弃;遗弃] 143. In order to..., you should... 为了..…•,你应该..…. In order to understand this essay fully, you should read more about its author. 为了更充分地理解这篇文章,你应该多看一些关于作者的介绍. 144. In other words, ... 换句话说,……. In other words, you should read and speak English crazily every day. 换句话说,你应该每天疯狂读英语,说英语. 145. In that case,… 既然那样,……. │ In that case, I have no more to say.既然那样,我没什么好说的了. 146. ...is of great importance. ......很重要. │ If you want to succeed in life, I think to set a goal for yourself is of great importance. 如果你想在生活中成功,我觉得为自己确立一个目标是非常重要的. 147. Is it convenient for you to... 你是否方便…… Is it convenient for you to post this letter for me when you go out 你出去的时候是否方便帮我寄这封信 148. Is it OK if… 如果……可以吗 Is it OK if I borrow your notebook tonight 我今晚借你的笔记本可以吗 149. Is it possible to... …有可能吗 Is it possible to exchange the milk shake for the ice cream 可以把奶昔换成雪糕吗 [milkshake:奶昔] 150. Is there a better way to... ……有没有更好的方法 Is there a better way to search for images on the Internet 在网上搜索图片有没有更好的办法 151. Is there any chance you could possibly... 你有没有可能…… Is there any chance you could possibly come to China 你有没有可能来中国 152. Is there anything else that... 还有别的……吗 Is there anything else that you don't understand 你还有什么不懂的地方吗 153. It appears that... 看来…,/ 似乎… It appears that great progress has been made in the IT industry. 看来信息产业取得了巨大的进步. 154. It depends on whether... 这取决于……是否……. It depends on whether you are determined to do it or not. 这取决于你是否决心要做这件事情. 155. It doesn't make sense to...…没有任何意义. It doesn't make sense to argue with him. 和他争论没有任何意义. 156. It doesn't matter whether /if... 如果……也没关系. It doesn't matter if you have made mistakes. Learn from your mistakes and you'll make progress. 如果犯错误了也没关系.从错误中学习,你就会进步. 157. It goes without saying that... 理应如此/不言而喻. It goes without saying that women should have equal rights and opportunities with men. 女性理应拥有和男性平等的权利和机会. 158. It makes a / no difference (to sb.) ... (对某人来说)……很重要/无所谓. It makes no difference to me whether you go or not. 你去不去对我来说都无所谓. 159. It occurred to me that... ……浮现于我的脑中.俄想起……. It suddenly occurred to me that ' knew how to solve that problem. 我突然想起我知道怎样解决那个问题. 160. It won't do any harm to... 没有坏处. It won't do any harm to try it. 试试又不会有什么坏处. 161. It would be wonderful if... 要是……那就太好了. It would be wonderful if we can go visit Mount Emei this summer! 要是今年夏天我们能去峨眉山旅游就好了1 162. It happened that...……很偶然. It happened that I won the football lottery last week. 我上星期偶然中了足彩. [ lottery n. 彩票;奖券] 163. It helps if ... 如果……的话,将会(对某人)有帮助/好处. It helps if you can conquer your shyness and yell out English crazily. 如果你能够克服你的羞涩,疯狂大喊英语,将会对你有好处. 164. It's amazing (that) ...……很了不起. It's amazing (that) China became the third country that launched a manned spacecraft. 中国成为第三个发送载人航天飞机的国家,真是很了不起. 165. It is/was...that/who... [强调句句型] It was Edward who told me about it. 告诉我这件事的是爱德华. 166. It is bad to....……是不好的. It is bad to push yourself too hard. Just try your best. 把自己逼得太紧不好.尽力而为就行了. 167. It's hard to imagine...…很难想像……. It's hard to imagine how he made it without any help. 很难想像没有人帮助,他是怎样成功的. 168. It is believed that...…人们认为……. It is believed that what she said is true. 大家相信她的话是真的. 169. It didn't /won't take long before... 没多久坏需要多久……就……. It didn't take long before he got used to life abroad. 没多久他就适应了国外的生活. 170. It is easier to... than to.......比.....容易. It is easier to buy a car than to keep one. 买车容易养车难. 171. It is easy enough to...……相当容易. It is easy enough to copy and paste; but you should write something by yourself. 抄袭(复制十粘贴)非常容易,但是你应该自己写一些东西. 172.It is essential that... 有必要……. [主语从句使用虚拟语气] It is essential that effective measures be taken to protect our civil rights. 有必要采取有效的措施来保障我们的公民权利. 173. It is good manners to do...……是有礼貌的表现. It is good manners to bring along a small gift or some flowers when you are invited to dinner by a foreign friend. 如果外国友人邀请你共进晚餐,去的时候带上一份小礼物或者鲜花是有礼貌的表现. 174. It is high time ... 现在是……的时候了./早就应该……了. [从句使用虚拟语气] It is high time we stopped talking about this silly question. 我们早就该结束讨论这个愚蠢的问题了. 175. It is hoped that... 希望……. It is hoped that no one was seriously injured in the car crash. 希望在这场车祸中没有人受重伤. 176. It is important that... ……是很重要的. [主语从句使用虚拟语气] It is important that something be done before it's too late. 在事情变得不能挽回之前采取一些行动是很重要的. 177. It's long been my dream to...……一直是我的梦想. It's long been my dream to make a speech in English. 用英语发表演讲一直是我的梦想. 178. It is (very /not) likely that... (很/没)有可能……. It is likely that it will rain this afternoon. 今天下午很有可能下雨. 179. It is (not) necessary to...……是(没)有必要的. 1) I think it is necessary to look before you leap. 我觉得三思而后行是有必要的. 2) When invited, it is not necessary for you to bring anything with you. 去做客不一定非要带礼物. 180. It is no use doing sth. 做某事是毫无用处的. It is no use talking without doing. 光说不做是没有用的. 181. It is not unusual for sb. to do... 某人做……不足为奇. It is not unusual for the British people to drink tea. 英国人喝茶不足为奇. 182. It is possible /impossible to...……是(不)可能的. It's impossible to predict the outcome of the game. 要预知比赛结果是不可能的. [ outcome n. 结果;成果] 1 83. It is dangerous to......危险. It is dangerous to explore the jungle with so many wild animals around. 在很多野兽出没的丛林里探险是危险的. 184. It is (rather) common to do... ……(相当)普遍. It is rather common for women to hold important positions in companies now. 如今女性在公司担任重要职位相当普遍. 185. It is reported that...据说……./据报导……. It is reported that the world famous football star will come to China next year. 据说那位闻名世界的足球明星明年要来中国. 186. lt is required that... 要求……. [主语从句使用虚拟语气l It is required that every student (should) attend the meeting this afternoon. 要求每个学生都参加下午的大会. 187. It is said that... 据说……. It is said that Liu Xiang will come to our city soon. 据说刘翔不久将来我市. 188. It is thought that... 人们认为……. It is thought that man's ability to learn languages makes him different from the animals. 人们认为人类的语言学习能力使其区别于动物. 189. It is (not) true that... ……(不)是真的. It is true that city life is much more exciting than country life. 确实,城市生活比乡村生活更令人兴奋. 190. It is (very) difficult to...……(非常)困难. It is very difficult to foretell what the world will be like in the future. 很难预测将来的世界会怎样. [ foretell v. 预言;预测] 191. Ifs really a challenge for me to...……对我来说确实是一个挑战. It's really a challenge for me to take this job, and I thin I will appreciate working with you. 做这份工作对我来说确实是一个挑战,我想我会很高兴和你们一起工作的. 192. It is (very) useful to...……很有用. It is very useful to recite English sentences and passages. 背诵英语句子和短文非常有用. 193. It is/ was obvious/clear that... 很明显……. It is obvious / clear that she is terribly nervous on stage. 很明显她在台上非常紧张. 194. It seems / seemed that... 好像…….似乎……. It seemed that no one knew what had happened.似乎无人知道发生了什么事. 195. It sounds like ...…听起来好像……. It sounds like a good idea. 听起来这主意不错. 196. It takes / took / will take sb. some time / money to do sth. 某人花/花了/将花多长时间/多少钱做某事. It took me years of hard work to speak good English. 为了讲一口流利的英语,我花了多年时间刻苦操练. 197. It wasn't until…that... 直到……才……. It wasn't until yesterday that I got your letter. 我直到昨天才收到你的来信. 198.It would be wonderful if... 如果……那就太好了. It would be wonderful if we can get together on Christmas. 如果圣诞节我们能聚一聚那就太好了. 199. It's not /just like sb. to do sth.……的行为不/正像某人的一贯作风. lt's not like Jim to be late for class. He regards time as the most important thing in life. 上课迟到不像吉姆的一贯作风,他把时间看作是生命中最重要的. 200. lt's a bad habit to...……是一个坏习惯. It's a bad habit to put off things until the last minute. 把事情拖到最后一刻才做是个坏习惯.