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Unit 1 book 4l.Once I stop, it all comes crowding in and I remember the chimps in laboratories.解析：once引导条件状语从句，意为“一旦”。e.g.: 一旦学会了利用失败，那么失败就能为你的生活作出积极的贡 献。Failure can make a positive contribution to your life once you learn to make use of it.2. Only after her mother came to help her for the first few months was she allowed to begin her project.解析：“only+状语”位于句首，后面主句用部分倒装。Eg:只有相互理解和相互学习，我们才能共同度过这些幸福的日子。 Only by understanding and learning each other can we spend these days together happily.3. Suddenly it hit me how difficult it was for a woman to get medical training at that time.解析：“Ithits/hitsb. +从句”表示“某人突然想起”。It occurs to sb.that.（某人）突然想到It strikes sb.that.（某人）突然想到It happens that.碰巧Eg:我突然想起，我把她的生日忘了。It hit me all of a sudden that I had forgotten her birthday.我突然意识到没有比健康更重要的东西了。It hit me that nothing is more important than health.Unit 2 book 4Dr Yuan Longping grows what is called super hybrid rice. 解析：what is called.所谓的 , what引导宾语从句。1. Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land and, even more dangerous, to peoples health.解析：have/ has been doing现在完成进行时。2. If so, what did you do to grow them?解析：迁so意为“如果是这样的话”，是if引导的条件状语从句的省略 形式。if ever如果有过/发生过的话if any如果有的话if possible如果有可能if necessary如果有必要3. He would much rather keep time for his hobbies. 解析：would rather (not) do sth.宁愿(不)做 。eg:他宁愿给学生上课也不愿被邀请参加乏味的会议。He would rather give lectures to the students than be invited to boring conferences.Unit 3 book 4As Victor Hugo once said, Laughter is the sun that drives winter from the human fhce”，and up to now nobody has been able to do this better than Charlie Chaplin.解析:as引导非限制性定语从句时，有“正如”之意，常放于主语之前， 有时也可放在主语之后或主语之中。e.g.:正如我们多次强调的那样，“为人民服务是我们的第一宗旨。 As we have stressed many times, “serve the people is our first policy.1. Unfortunately his father died, leaving the family even worse off, so Charlie spent his childhood looking after his sick mother and his brother. 解析：leaving the family even worse off为现在分词短语作结果状语。 Tips:现在分词作结果状语常表示意料、情理之中的结果，而不定式 作结果状语常表示出乎意料的结果。eg:大自然为我们的祖国提供了丰富的自然宝藏，使之成为我们幸 福的家园。Nature has provided our country with wealthy natural treasures, making it a happy home for us.他们上气不接下气地赶到公司，不料被告知他们被开除了。They reached the company out of breath only to be told they were fired.2. By his teens, Charlie had, through his humour, become one of the most popular child actors in England.在十多岁的时候，凭借着自己的幽默，查理已经在英国成为最受欢迎 的童星之一。解析：by表示“到.为止”，句子常用过去或将来完成时态。4. Then he picks out the lace of the shoe and eats it as if it were spaghetti.解析：as if引导的状语从句，若从句表达非客观事实或很不可能实现 的事情，从句要用虚拟语气。eg: He talks as if he knew everything.Unit 4 book 4The first person to arrive was Tony Garcia from Colombia, closely followed by Julia Smith from Britain.解析：to arrive是不定式做后置定语。当中心词是序数词或被序数词 限定时，常用不定式作后置定语。1. Not all cultures greet each other the same way, nor are they comfortable in the same way with touching or distance between people. 解析：nor位于句首，引&部分倒装。2. However, people from places like Spain, Italy or South American countries approach others closely and are more likely to touch them.解析：be likely to do sth.有可能做某事It，s likely that. = Sb.be likely to do.做某事是可能的E.g.: You are likely to suffer from bad health if you keep smoking. =It is likely that you will suffer from bad health if you keep smoking.3. Making a fist and shaking it almost always means that someone is angry and threatening another person.解析：V, ing作主语e.g.:众所周知，早起早睡是个好习惯。As we all know, going to bed early and getting up early is a good habit.Unit 5 book 4Whichever and whatever you like, there is a theme park for you! 解析：whichever and whatever you like 是让步状语从句。wherever= no matter where,whenever=no matter when,however=no matter how 弓 I 导让步状语从句；whatever, whichever, who(m)ever既可引导让步状 语从句，又可引导名词性从句。1. Futuroscope is not only for individuals, but is also the perfect mix of fun and learning for class outings.解析：not only.but also. “不但 而且 ”相当于 not just.but also.o若连接两个句子，且not only位于句首时，not only后面的句 子要用部分倒装。eg:我相信这些捐赠的书，不仅使你熟悉中国而且有助于你提高汉语。I believe these donated books will not only make you more familiar with China but also help improve your Chinese.通过这样做，我不仅与他人分享好的想法，而且学习清楚地表达自我。 By doing so, not only can I share good ideas with others but also learn to express myself clearly.3 Some parks are famous for having the biggest or longest roller coasters， others for showing the famous sights and sounds of a culture.解析：some.others.有些有些It will bring you into a magical world and make your dreams come true, whether you are travelling through space，visiting a pirate ship or meeting your favourite fairy tale or Disney cartoon character.构牟析：whether.or.无论还是e.g.:无论我们是今天去还是明天去，他都欢迎。 Whether we go today or tomorrow he will welcome us.
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