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[归纳拓展]
around which the bacteria had been destroyed是一个定语从句，修饰the dish。
“介词＋which＋从句”作定语，修饰名词，可以作限制性定语从句，也可以作非限制性定语从句，不能用that代替which；当介词置于从句的末尾时，that可以代替which。 类似的结构：“介词＋whom＋从句”修饰的先行词是人。 [语境助记]
(1)We are sitting in a classroom in front of which there is a tall tree. 我们正坐在前面有一棵高高的树的教室里。
(2)Scientists have advanced many theories about why human beings cry tears，none of which has been proved.(2016·浙江)
科学家们已经提出许多关于人类为什么哭泣时流泪的理论，其中没有一个得到证实。 (3)Many young people，most of whom were well-educated，headed for remote regions to chase their dreams.(2016·江苏)
很多年轻人前往偏远地区去追逐梦想，他们中的大多数人都受过良好的教育。 (4)Lei Feng is a Communist Party member from whom we learn how to serve the people. 雷锋是一位共产党员，从他身上，我们学习怎样为人民服务。 [题组训练]
(1)用适当的介词填空
①Frank’s dream was to have his own shop which to produce the workings of his own hands.
②Another unmanned spacecraft “Shenzhou Ⅱ”， which China greets the 21st century, marks new progress in the country’s space program. ③Air, which man can’t live, is really important. (2)句型转换
The English play which my students acted in at the New Year’s party was a great success. →The English play my students acted in at the New Year’s party was a great success. →The English play my students acted at the New Year’s party was a great success.
3.There is no doubt about it.此事毋庸置疑。 [归纳拓展]
(1)There is no doubt意为“毫无疑问”，后接that从句或“about＋名词”结构。There is doubt意为“……值得怀疑”，后接whether引导的从句或“about＋名词”结构。
(2)doubt v.& n.怀疑；疑问 作动词时，其用法如下：
①在肯定句中，doubt后面一般接whether或if引导的宾语从句。 ②在否定句和疑问句中，doubt后面接that引导的宾语从句。 作名词时，用法如下：
①用于肯定句时，一般接whether引导的同位语从句。 ②用于否定句、疑问句时，一般接that引导的同位语从句。 (3)be in doubt犹豫不决 beyond doubt无疑地 no doubt确实地；很可能 [语境助记]
(1)There is little doubt that our experiment will succeed. 几乎不用怀疑，我们的实验会成功的。
(2)There is some doubt whether she will come on time. 她是否能准时来有点让人怀疑。
(3)If you have any doubts about your health，you’d better consult your doctor at once.(2015·天津) 如果你对自己的健康状况有所怀疑的话，你最好马上咨询医生。 (4)No doubt he had not an idea that he was speaking Greek.(2015·江苏) 他很可能不知道他在说希腊语。 [题组训练]
(1)用whether，that，about填空
①There is no doubt he will win the match. ②There is some doubt he can help you. ③I have some doubt her timely arrival. (2)完成句子
①他犯罪的事实是不可否认的。 The truth of his guilt is . ②她对她是否是对的拿不准。
She whether she was right. ③我的兄弟们确实能记得打扫房间的时间。
My brothers can remember hours spent cleaning the house.(2016·浙江)
难句分析
If you had to choose the single most important discovery of the 20th century，you would have a real dilemma on your hands.
句式分析：句中所用的为虚拟语气，if引导的虚拟条件句表示 。虚拟条件句与主句间的时态对应关系如下： 对何时情况虚拟 现在 过去 将来 自主翻译：
条件句 (be动词用were) 过去完成时 /动词过去式(be动主句 would/could/might/should＋动词原形 would/could/might/should＋ would/could/might/should＋动词原形 词用were)/
Ⅰ.单词拼写
1.Too much time was spent arguing about the (程序). 2.She stopped (通信) with him after the death of her mother. 3.Local people lined up to d blood for the brave young man. 4.We are anxiously awaiting the o of the negotiation.
5.The doctor will see you again next week.M ，you must rest as much as possible. 6.She tried every means to c her child of the bad habit. 7.The branch (断裂) under their weight.
8.The invention has been (申请专利) by the university. 9.She faced a d about whether to accept the invitation or not. 10.There is no doubt that he is an (坦率的)person. Ⅱ.选词填空
not to mention，figure out，turn to，in a dilemma，go out
11.She was whether to stay at school or get a job.
12.We are too busy to take a long holiday this year， the fact that we can’t afford it.
13.No one could how he got to be so wealthy. 14.The candle light of itself. 15.His eager face disappointment. Ⅲ.完成句子
16.我如果看过这场电影，我就会把电影内容告诉你了。 If I had seen the film, I you about it. 17.如何才能长寿， 是人类数千年来力图寻求良好答案的问题。
How to live longer is a question man has tried to find a good answer for thousands of years.
18.他的研究会成功是毫无疑问的。
his success in his study. 19.妈妈正在打扫房间，与此同时，爸爸正在做饭。
Mother was cleaning the room. ，father was cooking. 20.我们正在湖里游泳突然下起了暴雨。
We in the lake the storm started. Ⅳ.课文短文改错
In just 100 years，the world changed complete.Amazed discoveries were made in many ways.Although it is impossible to choose the most important discovery，but it is possible to single out few pioneers of the 20th century.“E＝mc2” was born when Albert Einstein is suddenly inspired.Edwin Hubble，an astronomer，discovered small area of mist where were in fact galaxies.Alexander Fleming discovered a natural form of penicillin—a blue mould.The world’s first computer were produced by Eckert，an engineer and Mauchly，a physicist.With these breakthroughs，the world would have been a completely different place.