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1、Unit 1 book 8However, it is likely that Native Americans were living in California at least fifteen thousand years ago. 解析：it is likely that...有可能。 e.g.:很有可能有一些像地球一樣的星球，在那里可能也存在生命。 It is quite likely that there are some planets like the earth, on which there might also be life. 1. It is believed

2、 that before long the mix of nationalities will be so great that there will be no distinct major racial or cultural groups, but simply a mixture of many races and cultures. 解析：it is believed that...人們認(rèn)為湘信e.g.:人們認(rèn)為溫室氣體是全球氣溫升高的主因。 It is believed that greenhouse gases are the main causes of global wa

3、rming. 2. Built in 1873, the cable car system was invented by Andrew Hallidie, who wanted to find a better form of transport than horse — drawn trams. 解析：過去分詞短語作狀語。 e.g.:給予更多的關(guān)心和教導(dǎo)，這個孩子可能成為一名音樂家。 Given more attention and instruction, the child is likely to grow into a musician. 3. That's why tod

4、ay over 40% of Californians speak Spanish as a first or second language. 解析：That" s why...那就是為什么。 E.g.:他迷戀電腦游戲，那就是他為什么必須輟學(xué)的原因。 He is addicted to computer games； thats why he has to drop out of school. Unit 2 book 8The fact that she seemed to develop normally was very encouraging. 解析：that引導(dǎo)同位語從句。

5、 e.g.：這些年來地球逐漸變暖的事實，使科學(xué)家們非常擔(dān)心。 The fact has worried many scientists that the earth is becoming warmer and warmer these years. 1. Then came the disturbing news that Dolly had become seriously ill. 解析：then位于句首，句子用全部倒裝語序。(1)表示方位、時間或方 式的副詞或介詞短語，如：here, there, now, then, up, down, in, away, off, out,

6、in the room, on the wall 等置于句首時，句子倒裝。 (2)fact, news, hope, truth, idea, suggestion, thought, question, order, problem,belief, fear等后接同位語從句。 e.g.:山頂上有一座300多年歷史的古老城堡。 On the top of the mountain stands an old castle which has a history of more than three hundred years. 3 ? The advantage is that if t

7、here is a new illness some of these animals may die, but others will survive and pass on the ability to resist that disease to the next generation. 解析：The advantage is that...其優(yōu)點是 ，that引導(dǎo)表語從句。 e.g.：其優(yōu)點是如果你能講流利的英語，你更有可能找到好工作。 The advantage is that if you can speak English fluently, you are more lik

8、ely to find a good job. 4. However, scientists still wonder whether cloning will help or harm us and where it is leading us. 解析：whether...or無論還是e.g.:經(jīng)濟危機是否會很快結(jié)束，短時間內(nèi)不會明朗。 It is not immediately clear whether the financial crisis will soon be over or not. Unit 3 book 8Follow it up, explore all aro

9、und it, and before you know it, you will have something worth thinking about to occupy your mind. 解析：祈使句+ and+陳述句= If..., +主句祈使句 + or/otherwise+ 陳述句=If...not..., + 主句 E.g.: Forget the past, leaving the sadness behind, and you" 11 see the door of a new bright world open before you. Give up smoking

10、, or/otherwise you may die of lung cancer. A bit more effort, I think, and you will settle the problem. 1. The criteria are so strict that it is difficult to get new ideas accepted unless they are truly novel. 解析：so...that...引導(dǎo)的結(jié)果狀語從句。 3 ? The next morning I got up early before the sun was hot.

11、解析：before意為“在……之前”，引導(dǎo)時間狀語從句。 4. Only after you have had that recognition can you say that you are truly an inventor. 解析：only +狀語位于句首部分倒裝。 Unit 4 book 8Henry Higgins and Colonel Pickering are sitting deep in conversation. 解析：形容詞短語deep in sth.意為“專心；全神貫注；深陷”，在句 中作狀語。 eg:由于陷入深思中，他沒有注意到車正朝他駛來。 Deep

12、in thought, he didn't notice the car running towards him. 1. But，sir, (proudly) once educated to speak properly, that girl could pass herself off in three months as a duchess at an ambassador's garden party. 解析:once educated是省略結(jié)構(gòu)，完整形式為once the girl is educatedord never have come if I'd known about

13、this disgusting thing you want me to do... 解析：if +haddone+主句would have done表示對過去的虛擬Unit 5 book 8 1. Yes, indeed, as the botanical analyses have shown us, all the fields around here used to be part of a large shallow lake. 解析：as引導(dǎo)的非限制性定語從句，as指代整個主句的內(nèi)容，意為“正 如"。 eg:正如古訓(xùn)所說“人不可貌相，海水不可斗量”。 "You can't judge a book by its cover； as the old saying goes . 2. If only she had looked ahead and planned better this year! 解析：威句用了虛擬語氣。if only...意為“要是就好了”。 3. Abruptly she sat down, only to be scooped up by her laughing, shouting sister, Luna. 解析：only to do動詞不定式表出乎意料的結(jié)果。