介词+关系副词引导的定语从句

介词+关系副词引导的定从句

定语从句中介词+关系副词的判断一般要在结构和意义上进行判断，二者缺一不可！

1. 介词+ 关系副词在意义上表示，从...的角度看；自从...时候起。以下第一组句子在意思上不具备这样的意思。

2. 介词+ 关系副词在形式上先行词必须是介词+ 时间/地点的一个状语都是一个介词短语。研究一下第二组句子的先行词形式。when/where 通常代指的是介词短语。

注意：since后只能用where, 而不能用which 因为根据以上原则，副词应代指的是一个状语，而不是一个名词。

I'll never forget the time when we worked on the farm.

Do you remember the afternoon when we first met three years ago?

The hotel where we stayed wasn't very clean.

I'd like to live in a house where there is plenty

We went up to the roof of the temple, from where we had a good view of the procession.

They stood near the north window, from where they could see the whole garden.

Look over there! Some people are standing under the tree on the hill, from there you can enjoy the whole view.

That was in 1949, since when things have been better.

They left in Monday, since when we have heard nothing.

I went to bed at ten, before when I was reading for an hour.

Next summer, by when the house should be ready.

1. He was blown off course and found himself in an unkown land, from where he eventually reached Greenland.

2. He stood under the tree, from where he could see his son swimming.

3. You can go across the river, from where you can take a boat.

4. The book was written in 1946, ___ the education system has witnessed great changes.（07山东）

A. when

B. during which

C. since then

D. since when

定语从句中关系副词的用法

定语从句中关系副词的用法 关系副词，顾名思义，是联系先行词和定语从句的词，属于副词。定语从句中的关系副词有三个：when, where和why，它们在定语从句中分别作时间、地点和原因状语。其句法结构如下： 表时间的名词 + when + 定语从句 time,day,hour,year when指时间，在定语从句中作时间状语。 例句：I still remember the day when I first came to Beijing. I’ll never forget the day when I joined the army. 表地点的名词 + where + 定语从句 place,room,house where指地点，在定语从句中作地点状语。 例句：The factory where his father works is in the west of the city. This is the house where I lived two years ago. 表原因的名词reason + why + 定语从句(why只用于reason之后的限制性定语从句中,在定语从句中作原因状语。) 例句：That is the reason why I did the job.(在现代英语中why可以省略) 上句也可以这样表示： That is the reason I did the job. 又如： This was the reason (why )we raised the temperature. 关系副词在定语从句中的用法看似简单，以下注意点不可忽视： 1）当先行词是时间，地点，原因时，并不是一定对应使用when，where，why The factory ________ I visited is not far from here. 诀窍：1.先找定语从句：____I visited, 2.假设可填入which，which I visited, which指代factory 3.看定语从句是否完整；I visited the factory。 很完整，which正确，或that The factory ________ I work is not far from here. 1. ___I work 2. which I work,,,,which指代factory 3.看定语从句是否完整I work the factory. I work in the factory，可见缺少in 4.因此应该是in which I work=where I work *I will never forget the day when I first met you on the seashore. *I will never forget the days which/that we spent together in Xueyao Middle School. **This is the hospital where my mother works. **This is the hospital which/that we visited the day before yesterday. ***The reason why he did not go to school is that he was ill. ***This is the reason which/that he gave his boss in the office . 2) “when”、“where”和“why”都可以替换成“介词 + which”，介词的选用取就于先行词和定语从句中的动词。例如： Do you still remember the day on which we first met in Nantong?(on which=when) This is the room in which we lived last year.(in which=where)

关系副词引导的定语从句电子教案

关系副词引导的定语从句 一.关系副词where引导的定语从句。 where引导的定语从句其先行词往往是表示地点的名词。 1.China is the only country where wild pandas can be found. 2.This is the house where I lived two years ago. 知识拓展： 如果定语从句分别修饰point, situation, stage, condition和case, position 等表示抽象意义的词，常用where / prep + which引导，意思是“到了某种地步，在某种境况中”。 I’ve come to the point where I can’t stand him. I have reached a point in my life where I am supposed to make decisions of my own. 练一练 1. It’s helpful to put children in a situation _______ they can see themselves differently. 2. Life is like a long race _____we compete with others to go beyond ourselves. 3. They will fly to Washington, ___ they plan to stay for two or three days. 二．关系副词when引导的定语从句 when引导的定语从句其先行词往往是表示时间的名词。 The time when I first met Nelson Mandela was a very difficult period of my life. Ｉcan’t forget the year when I studied English in Beijing University. 练一练： 1. Because of the financial crisis, days are gone _____ local 5-star hotels charged 6,000 yuan for one night. 2. We went through a period ___ communications were very difficult in the rural areas. 3. Occasions are quite rare _____ I have the time to spend a day with my kids. 三．关系副词why 引导的定语从句。why引导的定语从句其先行词是reason。 The reason why he didn’t come to the party is that he didn’t want to see Jane. Can you tell me the reason why you are late? 练一练 1) The reason ________he didn’t come was that he was ill. 2) The reason __________ he explained is not true. 3) The reason ___ he was absent was ___ he had a bad cold. 四．“介词+ 关系代词”引导的定语从句:介词后的关系代词只能是which （指物）whom（指人）

“介词+关系代词”引导的定语从句

“介词+关系代词”引导的定语从句 请同学们先看下面的高考题： 1. Human facial expressions differ from those of animals in the degree ______ they can be controlled on purpose. A. with which B. to which C. of which D. for which 2. Last month, part of Southeast Asia was struck by floods, from ______ effects the people are still suffering. A. that B. whose C. those D. what 3. I saw a woman running toward me in the dark. Before I could recognize who she was, she had run back in the direction ______ she had come. A. of which B. by which C. in which D. from which 4. Last week, only two people came to look at the house, ______ wanted to buy it. A. none of them B. both of them C. none of whom D. neither of whom 【点拨】 ●“介词＋关系代词”既可以引导限制性定语从句，也可以引导非限制性定语从句。在此结构中，关系代词指人时用whom，不可用who或that；指物时用which，不能用that；关系代词是所有格时用whose。但如果介词后置，则不受这种限制，关系代词还可以省去，尤其在口语中。如： 1) Do you know the girl to whom our teacher was talking? = Do you know the girl (that/who/whom) our teacher was talking to? 2) The school (that/which) my brother once studied in is very famous. = The school in which my brother once studied is very famous. 2.关系副词when，where，why可用“介词＋which”来代替。关系副词实际上是介词＋先行词。其中 when=表时间的介词（如：in，at,on,during等）+which； Where=表地点的介词（如：in，at,on,under等）+which； Why=表原因的介词（如：for）+which (1)当先行词表示时间，定语从句中缺少时间状语时，通常用关系副词when引导，此时也可选用表示时间的介词＋which来代替关系副词when。 I still remember the day when I came here. ( on the day =when) (2)当先行词表示地点，定语从句中缺少地点状语时，通常用关系副词where引导，此时也可选用表示地点的介词＋which来代替关系副词where。 This is the house where I lived last year. ( in the house= where) (3)当先行词为reason，定语从句中缺少表示原因状语时，通常用关系副词why引导，此时也可以用for which来代替关系副词why。 There are many reasons why people like traveling. (for the reasons =why) 注意： 1. 含有介词的短语动词一般不拆开, 介词仍放在短语动词的后面。如: look for, look after, take care of， pay attention to, look forward to 等。

关系副词引导定语从句

关系副词的意思相当于“介词 +which结构”，在定语从句中做状语的成分。 拆分法分析几个句子，如下： 1.He will always remember the day when/on which his father returned from America. 他将永远记得父亲从美国返回的那一天 拆分后： He will always remember the day. His father returned from America on the day.. 2.This was the time when/at

which she left for Beijing. 这就是她动身去北京的时间。 拆分后 This was the time. She left for beijing at the time. 3.I don't know the reason why/for which he didn't come to the meeting yesterday morning. 我不知道他为什么没有参加昨天上午的会议。 I don't know the reason. He didn't come to the meeting yesterday morning for the reason. 重要提示：在when、where、why 关系副词引导的英语定语从句中，只

会出现when、where、why或on which、at which、for which等等，绝对不会出现on when、at where、for why 这种情况，因为关系副词引导的定语从句只能起状语作用，既不能做动词的宾语，也不能做介词的宾语。 选出正确的定语从句 1、 A.The man is said to come from a town where nobody knew. B.The man is said to come from a town which nobody knew. 2、 A.That is the age in when people live in peace and happiness.

定语从句关系代词和关系副词辨析

先观察下面各句，尝试总结一下红色部分的用法。 Do you remember the days when / in which I stayed with you in the USA? 你还记得我和你在美国共度的那些日子吗？ 2) The factory where / in which he worked for twenty years is closing down. 他效力了20年的那个工厂倒闭了。 3) The reason why / for which he was late for school was that he didn’t catch the bus. 他之所以迟到，原因是没赶上公交车。 4) I have read the book in which you are interested. 我读了那本你感兴趣的书。 5) The man with whom I talked just now comes from Japan. 刚刚和我交谈的那个男人来自日本。 6) This is the book which she is looking for. 这就是她正在找的那本书。 小结归纳 ●when 通常放在表示时间的名词后引导定语从句，如句1）； ●where放在表示地点的名词后引导定语从句，如句2）； ●why经常放在reason的后面来引导定语从句，如句3）； ★当引导定语从句时，关系副词一般可以转化为“介词+ 关系代词”，即： when / where 可转化为on / in / at等+ which， why可转化为for which（在口语中可用that或省略），这也是定语从句中的一种常见现象。 ★需要特别注意的是此时介词后的关系代词不能用that，如句1）、2）、3） ★另外，指代先行词的关系代词which, whom在从句中作介词宾语时，可以把“介词+ 关系代词(which / whom)”一起放在先行词和从句之间，如句4）、5）；★但含有介词的短语动词一般不拆开，介词仍放在动词的后面，如句6）。 **★关系代词that和which在定语从句中充当主语或宾语 ★关系副词when/ where/ why分别在定语从句中充当时间状语，地点状语和原因状语。例如： This is the house where/ in which we once lived. 这是我们曾经住过的房子 （Where相当于in the house 做地点状语） This is the house which/ that they built last year. 这是他们去年建的房子 （which/ that 指代house 做built 的宾语） I’ll never forget the days when/on which we stayed in Beijing. 我永远不会忘记我们一起在北京的日子 （When相当于on the days 做时间状语，on the days “在这些日子”） I’ll never forget the days which we spent in Beijing.我永远不会忘记我们一起在北京的日子（Which指代the days 做spent的宾语） That is the reason why/ for which she told a lie. 那就是她为什么撒谎的原因。 （Why相当于for the reason 做原因状语 That is the reason which was told by the boy. 那就是那个男孩说的原因。 （Which 指代the reason 做主语） 注意：★确立关系代词which/that或关系副词when/where/why的方法： 看定语从句中是否缺少主语或宾语，如果缺少用which/ that； 如果不缺主语或宾语用when/where/ why.

定语从句关系副词讲解及练习

Unit 2 Growing Pains 定语从句（2）--- 定语从句中关系副词的用法 Learning Content : Learn Attributive Clauses --- Relative adverbs: where, when, why Learning Aims: Learn how to use relative adverbs in attributive clauses Learning difficult and important points : The difference between relative adverbs and relative pronouns Period ：One 自主学习过程 关系副词是联系先行词和定语从句的词。定语从句中的关系副词有三个：when, where 和why ，它们在定语从句中分别作时间、地点和原因状语。其句法结构如下： 1. 表时间的名词+ when + 定语从句，when 指时间，在定语从句中作时间状语。例句：I still remember the day when I first came to Beijing. I ' nllever forget the day when I joined the army. 2. 表地点的名词+ where + 定语从句，where 指地点，在定语从句中作地点状语。例句：The factory where his father works is in the west of the city. This is the house where I lived two years ago. 3. 表原因的名词reason + why + 定语从句（why 只用于reason 之后的限制性定语从句中,在定语从句中作原因状语。） 例句：That is the reason why I did the job.（在现代英语中why 可以省略）上句也可以这样表示：That is the reason I did the job. 关系副词在定语从句中的用法看似简单，以下注意点不可忽视： 1）“when” “where和“why的运用取就于表时间的名词、表地点的名词和表原因的名词reason在定语从句中所作的成分，比较下面的几组句子： *I will never forget the day when I first met you on the seashore. *I will never forget the days which/that we spent together in Xueyao Middle School. **This is the hospital ________ my mother works. **This is the hospital ________ we visited the day before yesterday. 知识小结（判断定语从句引导词的方法） 方法一：不及物动词则要求用关系副词when, where, why, 从句中的谓语为及物动词且后面无宾语，就必须要求用关系代词； 方法二： 先行词在从句中做主、定、宾语时选择关系代词（who, whom, that, which, whose）; 先行词在从句中做状语时选择关系副词（ where 地点状语，when 时间状语，why 原因状语） 2）“ when” “ where和“ why都可以替换成介词+ which，介词的选用取就于先行词和定语从句中 的动词。例如： Do you still remember the day on which we first met in Nantong?（on which=when） This is the room in which we lived last year.（in which=where）

定语从句(3)关系副词引导的定语从句

在看本文之前请先看看关系代词和介词+关系代词引导的定语从句 我们首先来看看最常见、最简单的where: (1) Where do you live? 你住在哪儿？ (2) Where are my keys? 我的钥匙在哪儿？ 从上面可知，where最基本的意思为：在哪儿(里) 其实定语从句中的where也是类似的，只是没有疑问：在……(地方) 如： (3) This is the room where the children sleep. 从句where the children sleep的意思为： 孩子们在这个房间睡觉。 (4) The town where I grew up is small. 从句where I grew up的意思为： 我在那个镇长大。 这里where更具体一点就是：在先行词(那个地方) 现在我们再来看看在定语从句第一、二部分讲的还原法： 上面的(3)、(4)两句，从句都有"在……"的意思，先行词可以直接还原到定语从句中去吗？当然不行，先行词只是一个名词/代词，它本身并没有“在……”这个意思。因此： 表示地点的先行词后面是用关系代词还是关系副词的方法： (1). 如果从句需要加一个介词(“在……”)，就用关系副词where；

(2). 如果从句不缺介词(“在……”)，就用关系代词： 第一种情况：已经有了介词“在……” 第二种情况：不需要介词“在……”(直接作主语、宾语、表语或表示所属关系) 例如： 例3的先行词还原到从句变为： The children sleep the room. 这个句子the room前面需要加上介词(in)才对。所以用关系副词where。 如果这个句子改动一下变为： (5) This is the room _______ the children sleep in. 这个句子的定语从句部分已经有介词in，先行词可以直接还原(作介词宾语)：The children sleep in the room. 因此，此题用关系代词that/which或省略。 再来看一例： (6) Wuhan is the city _______ I like best. 这个句子先行词可以直接还原： I like the city best. The city作动词like的宾语，因此用关系代词that/which或省略。 从上面可知：关系副词where=in/on/at…+which when用作关系副词表示时间，与where类似， when=in/on/at…+which 例如： I'll never forget the day when I met you.

介词 关系词引导的定语从句

介词+关系代词引导的定语从句 【知识点1】 直接位于介词之后的关系代词只能是which或whom，构成介词+which（指物）；介词+whom （指人）两种结构。 【例】The man to whom you talk just now is a famous runner. 【例】The service about which the students complain a lot should be improved. 【例】He is a library assistant from whom I borrowed some books. 【例】It is a famous school from which he graduated 3 years ago. 【例】The chair on which he is sitting now is made of wood. 【知识点2】 直接位于介词后面的关系代词不能省略，但如果将介词移于句子末尾而不位于关系代词之前时，可省。 【例】The man (who/that/whom) you talk to just now is a famous runner. 【例】The service (which/that) the students complain about a lot should be improved. 【例】He is a library assistant (whom/that/who) I borrowed some books from. 【例】It is a famous school (which/that) he graduated from 3 years ago. 【例】The chair (which/that) he is sitting on now is made of wood. 【知识点3】 关系副词when, where, why 可以相应地转化为：介词+which结构。 【例】This is the house where I lived two years ago. =This is the house in which I lived two years ago. 【例】Do you remember the day when you joined our club? =Do you remember the day on which you joined our club? 【例】I don’t know the reason why he said so. =I don’t know the reason for which he said so. 【知识点4】 有一些动词短语中的介词是固定搭配，不可以拆开，一般还是放在动语之后，不提前： 【例】He is the student (who/whom/that) the teachers are looking for. 【例】The number of the children (who/whom/that) she takes care of is 30. 【知识点5】 注意复杂介词短语+which或whom引导的定语从句，是高考考查热点。 【例】They finally climbed up the mountain, on top of which many strange birds were seen. 【例】Look at the photo. This is Mr. Green, in front of whom sit three students. 【知识点6】 不定代词+of+ which/ whom 引导的定语从句可化为of+ which/ whom+ 不定代词结构；这也是高考常考点。其中用到的不定代词有some, any, none, both, all, many, a few, few, a little, little, either, neither, one, 等等。 【例】There are 40 students in our class, most of whom（=of whom most）like English.

介词引导的定语从句 -答案

介词+关系代词引导的定语从句 “介词+关系代词”引导的定语从句是定语从句的一种复杂形式，这类定语从句的关系代词主要有which ,whom , whose , 它们既可以引导限定性定语从句，也可以引导非限定性定语从句。关系代词前该选用什么样的介词，要根据不同的语境、习语、惯用法等来决定。一．介词选择的主要标准 1.介词与定语从句的先行词是一种习惯性搭配 Human facial expressions differ from those animals in the degree to which they can be controlled on purpose.人类的面部表情和动物的面部表情就可控制的程度来说是不一样的。( to a degree ) The English play in which my students acted at the New Year’s party was a great success.那场在新年晚会上我学生参加表演的英语剧很成功。( in the play ) The schools themselves admit that not all children will be successful in the jobs for which they are being trained.学校本身承认，并不是所有的孩子都能在他们所接受的培训的职业成功。( be trained for the job ) 2.介词与定语从句中的动词是一种习惯性搭配 Who is the man with whom our teacher is shaking hands? 我们的老师与之握手的那个男士是谁？( shake hands with sb. ) Last month , part of Southeast Asia was struck by floods , from whose effects the people are still suffering. 上个月，东南亚的部分地区发生洪水，人们还在遭受着洪水所带来的影响。(suffer from sth. ) 3.介词与定语从句中的形容词构成一种习惯性的搭配 Ours is a beautiful country , of which we are greatly proud . 我们的国家是一个美丽的国家，我们为之感到很自豪。( be proud of ) The woman to whom Spielberg is married is an actress. 同斯皮尔伯格结婚的女人是一位演员。( be married to ) The woman to whom he was engaged was a doctor. 他与之订婚的那个女士是位医生。(be engaged to ) 4.有时关系代词前用什么介词，要根据句子的意思来决定，此时不但要注意其前的搭配，也要注意其后的搭配 I was a woman running toward me in the dark. Before I could recognize who she was, she had run back in the dark.Before I could recognize who she was , she had ran back in the direction from which she had come.看见一位妇女在黑暗中像我走来，我还没来得及认清她是谁，她已经从她来的方向跑回去了。（如果仅注意先行词，很容易受习惯心里的影响而使用in this direction 的搭配，但考虑到语境后的come ，则应该使用from。） He was educated at the local high school, after which he went on to Beijing University. 他在当地一所高中上学，之后他上了北京大学。（after which 的意思就是“在当地一所高中接受完教育之后”）。 In the office I never seem to have time until after 5:30 pm. by which time many have got home.在 办公室我好像总是没时间，只有等到下午五点半，而那个时候大家都已经回家了。（此句不能受at 5:30 pm 的通常表达的影响而选用介词at, 而应该依据整个句子的语意来确定介词。）5.表示“所有格”或“整体与部分关系”时，用介词of The journey around the world took the old sailor nine months, of which the sailing time was 226 days.这次环球旅行老水手用了9个月，其中航行的时间是226天。 The factory produces half a million pairs of shoes every year, 80% of which are sold abroad. 这个工厂每年生产50万双鞋，其中的（指50万双鞋）80%销往海外。 I was told that there were about 50 foreign students studying Chinese in the school, most of whom

介词+关系词引导的定语从句

介词+关系代词”引导的定语从句 介词加关系代词引导的定语从句要注意以下几点： 1．“介词+ 关系代词”引导的定语从句时，介词的宾语只能用which（指物）和whom （指人），即：介词+which/whom。不能用that 和who。 .This is the teacher from whom we’ve learned a lot. 这就是从他那里我们学了很多东西的老师。 Great changes have taken place in the city in which we live. 我们所居住的城市发生了巨大的变化。 2．有时介词也可放在从句的末尾，这时关系代词可用which/that(指物)， who/whom/that（指人），也可以省略。 . The situation (which/that ) we had got into was very dangerous. 我们当时的处境很危险。 The man (whom/who/that) you were talking to just now is my English teacher. 你刚刚和他谈话的那个人是我的英语老师。 3．当定语从句中的谓语动词短语是固定搭配，不可分割时，那么动词短语中的介词不能前置。 .This is the pen which I’m looking for. 这是我正在找的那支钢笔。 不能写成：This is the pen for which I’m looking. 4．定语从句也可由“名词/代词/数词+介词+which/whom”引出。 . That old man has two sons, one of whom is a doctor. 那个老人有两个儿子，其中一个是医生。 The house, the windows of which ( = whose windows = of which the windows) were damaged, has now been repaired. 窗子遭破坏的那栋房子现在已经修好了。 5．引导定语从句的关系副词(when, where, why) 可以用“介词+关系代词”代替。 .I’ll never forget the day when I joined the party. (when= on which). 我永远都不会忘记入党的日子。 The factory where my father works is in the east of the city. (where = in which). 父亲工作的那家工厂在城东。 None of us know the reason why Tom was absent from the meeting. (why = for which). 我们都不知道汤姆缺席会议的原因。

定语从句之关系副词

定语从句之关系副词 引导定语从句的关系副词有when，where，why 等。它们和关系代词一样放在先行词的后面起引导作用，同时在定语从句中分别充当时间、地点和原因状语。 1. when 指时间，在定语从句中作时间状语。如： Can you still remember that evening when we met for the first time？ 你还记得我们第一次见面的那个晚上吗？ 2. where 指地点，在定语从句中作地点状语。如： Can you show me the house where Shakespeare lived？ 你能带我看看莎士比亚曾住过的那座房子吗？ 3. why 指原因，在定语从句中作原因状语。如： I don't know the reason why he didn't tell it to his father。 我不明白为什么他没有把这件事告诉他父亲。 4. 由于关系副词在定语从句中相当于“介词＋名词”，如：when ＝on / in / during the day，where= in / at / on the place，why ＝for the reason ，因此关系副词引导的定语从句可以改写为“介词＋which ”引导的定语从句。如： That is the day when （on which ）he did the experiments。 就是他做实验的那一天。 This is the house where （in which ）my father used to live。 这就是我父亲以前住过的房子。 That is the reason why （for which ）he is leaving very soon。 那就是他为什么要马上离开的原因。 注意：在这种“介词＋which ”的结构中，介词的选择取决于which 所指的名词与介词的搭配关系，或者取决于定语从句中动词词组与介词的搭配关系。如： This is the farm where （on which ）I worked three years ago。 这就是我三年前工作过的农场。 He can't forget that year when （in which ）he was taken to Beijing。 他忘不了他被带到北京去的那一年。 5.关系代词和关系副词的选择 先行词是表时间或地点的名词时，关系词的选择要慎重，以下技巧可帮助你解决此类问题。（ 1 ）分析句子结构，看表时间或地点的先行词在定语从句中是作状语，还是作主语和宾语。（ 2 ）看定语从句中的动词是及物动词，还是不及物动词，还是“不及物动词＋介词”结构。 比较：This is the place where he worked （vi ）when he was young。 The city （that / which ）we visited （vt ）is well-known。 We'll never forget the day （that / which ）we spent （vt ）in the village。 We'll never forget the day when we work （vi ）in the village。

介词+which引导的定语从句

“介词＋关系代词”引导的定语从句 罗家群编 一．课本中的“介词＋关系代词”引导的定语从句。 1.Have you ever dreamed of playing in front of thousands of people at a concert, 2.They may start as a group of high-students, https://www.wendangku.net/doc/bc5764960.html,ter they may give performances in pubs or clubs, 4.The musicians were to play jokes on each others as well as play music, 5.However,after a yaer or so, the Monkees started to play and sing their own music. 6.They produced a new record in 1996, 二．用法总结 1) 根据先行词的搭配习惯来决定。 1. Many people who had seen the film were afraid to go to the forest when they remembered the scenes __________people were eaten by the tiger.很多看过这个电影的人记起老虎吃人的这个场景的时候都不敢到森林里去。 2. The English play ___________my students acted at the New Yea r’s party was a great success. 我的学生在新年晚会上表演的英语剧获得了很大的成功。 3.Some biologists believe this is an ancient survival strategy,____a diet with 30 percent fewer calories than usual increased life span.一些生物学家相信这是一种古老的生存策略——食物中的热量少30%可以延长寿命。 2) 根据定语从句所表达的意义来确定 1.He was educated at the local high school,__________he went on to Beijing University.他在当地的高中上的学，之后他去了北大上学。 2.Mark was a student at this university from 1999 to 2003,_________he studied very hard and was made Chairman of the Students’ Union.马克1990至2003年在这个大学读书。在此期间他学习努力并担任学生会主席。