资源简介

(共37张PPT)
Period 4　
UNIT 3　FOOD AND CULTURE
主题语境
人与社会——不同民族的文化习俗
课时学案 单元语法讲练(Learning About Language)
过去完成时
一、过去完成时的构成
过去完成时由“had done”构成。
Silk had become one of the primary goods traded along the Silk Road by about 100 B.C．
在公元前100年左右，丝绸已经成为“丝绸之路”上交易的主要商品之一。
二、过去完成时的用法
1．表示在过去某一时刻或某个动作之前已经发生或完成的动作或存在的状态。表示的时间是“过去的过去”，这个过去的时刻常用由by，before等引导的短语或时间状语从句来表示，也可以通过一个表示过去的动作或上下文来表示。
The student completed this experiment to make what Professor Joseph had said come true．
为了使约瑟夫教授所说的事情成为现实，这个学生完成了这个实验。
By the end of last year，he had collected more than 100 foreign records．
到去年年底，他已收集了超过100张外国唱片。
2．表示过去某一时刻之前发生的动作或存在的状态一直持续到这一过去时刻，并可能继续下去，常与由for或since引导的表示一段时间的短语或从句连用。
I had been at the bus stop for 30 minutes when a bus finally came．
当一辆公共汽车终于来到的时候，我已在公交车站等了30分钟。
He said that great changes had taken place in his hometown since 1990．
他说自从1990年以来他的家乡发生了很大的变化。
3．want，hope，mean，plan，intend等动词的过去完成时可以用来表示过去未曾实现的想法、希望、打算或意图，意为“本来……”。
They had wanted to help but couldn't get there in time．
他们本来是要去帮忙的，但未能及时赶到那里。
He had hoped to be back last night, but he didn't catch the plane．
他本来希望昨晚回来，但他没赶上飞机。
4．常用过去完成时的固定句型。
(1)在“hardly...when/no sooner...than”句型中，主句用过去完成时，从句用一般过去时。hardly或no sooner位于句首时，句子要用部分倒装结构。
Hardly had we sat down when the phone rang．
＝We had hardly sat down when the phone rang．
我们刚坐下电话就响了。
I had no sooner arrived home than it began to rain．＝No sooner had I arrived home than it began to rain．
我刚到家就开始下雨了。
(2)It was the first/second/...time that...句型中的that从句用过去完成时。
It was the first time that I had chatted online in English．
那是我第一次用英语在网上聊天。
[即时训练1]　单句语法填空
①Hardly had I got home _____ it began to rain heavily．
②No sooner had he begun to speak_____ the audience interrupted him．
③It was the second time that she ________ (win) first prize in the physics contest．
④The minute I saw a lady getting off the bus, I knew it was her, for I _________ (see) her before．
⑤I __________ (mean) to see you off, but I was delayed by the jam．
when
than
had won
had seen
had meant
三、过去完成时与一般过去时的用法比较
虽然这两种时态都表示过去发生的动作或存在的状态，但在使用时应注意以下两点不同：
1．过去完成时在时间上强调“过去的过去”，而一般过去时强调过去某一特定的时间。
They had arrived at the station by ten o'clock yesterday．
他们昨天十点就已经到达了车站。
They arrived at the station at ten o'clock yesterday．
他们昨天十点到达了车站。
2．在没有明确地表示过去的时间状语时，谓语动词表示的动作发生的时间先后顺序须依据上下文来判断：先发生的动作用过去完成时，后发生的动作则用一般过去时。
Learning that she had won the prize，her teacher was very pleased．
得知她获奖的消息，她的老师非常高兴。
[即时训练2]　单句语法填空
①When I woke up that morning, it ___________ (stop) raining so I could go out as scheduled．
②I knew it was you who __________ (pick) up my schoolbag and handed it in．
③I began collecting stamps in February and by November I_____________
(collect) more than 2，000．
④I __________ (hope) to go to your birthday party, but I was too busy．
had stopped
had picked
had collected
had hoped
四、过去完成时的被动语态
过去完成时被动语态的构成：
1．肯定句式：主语＋had been＋过去分词。
The room had been painted twice before she lived in it．
这个房间在她住进去之前已经被粉刷过两次了。
2．否定句式：主语＋had not been＋过去分词。
The room had not been painted before she lived in it．
这个房间在她住进去之前没有被粉刷过。
3．一般疑问句式：Had＋主语＋been＋过去分词？
Had the room been painted before she lived in it
这个房间在她住进去之前被粉刷过吗？
4．特殊疑问句式：疑问词＋had＋主语＋been＋过去分词？
How many times had the room been painted before she lived in it
这个房间在她住进去之前被粉刷过几次？
[即时训练3]　单句语法填空
①Returning to the camp, they were shocked to see everything___________
_______(ruin)．
②By the time he got to the school, the first period__________________
(finish)．
③We went to the playground with the kites which _______________ (make) by ourselves．
had been
ruined
had been finished
had been made
④The boy was reminded that his homework which _________________ (hand) in was not satisfactory．
⑤How many buildings __________________ (destroy) when the hurricane ended
had been handed
had been destroyed
短文语境填空
A cow and a fox went out to search for food together． They 1．_________ (go) only a few miles before they saw a lion coming their way． They were both very frightened． The fox 2．_______ (think) of a way of saving his own life, and went up to the lion and said in his ear，“I 3．_________ (help) you get hold of the cow without the trouble of hunting him, if you let me go free．” The lion 4．_______ (agree), and the fox then led the cow by a hidden pit(坑), which a hunter 5．_______
had gone
thought
will help
agreed
had dug
(dig) as a trap for wild animals，and the cow 6．____ (fall) into it． When the lion saw that the cow 7．______________ (catch) and couldn't get away, he 8．______ (turn) his attention to the fox． He soon finished him off, and then 9．_____ (go) on to eat the cow．
Betray(背叛) a friend, and you'll often find you 10．_____________ (destroy) yourself．
fell
had been caught
turned
went
have destroyed
①as to 关于；至于(后可接从句或“疑问词＋不定式”结构)
②make up 形成，构成
③insist vt．& vi．坚持说(后跟that从句时，从句用陈述语气)；坚决要求，坚持(后跟that从句时，从句用虚拟语气，即从句谓语用“should＋动词原形”，should可以省略)
课下预习 第二篇课文(Using Language)
④fatty food 高脂食物
fatty adj．富含脂肪的；肥胖的；脂肪的
⑤driver n．驱动因素
⑥association n．[C]协会
⑦regardless of 不管；不顾
⑧argue over/about... 争辩……；为……争论
⑨limit...to... 将……限制在……范围内，其被动形式be limited to...也很常用。
⑩can [熟词生义] n．[C]一听(的量)
cut down on 削减，减少
cut out 停止做(或使用、食用)；删去
altogether adv．(用以强调)完全，全部；(表示总数或总额)总共，一共
category n．[C]类别；种类
vitamin n．[C]维生素
fibre(US fiber) n．[U]纤维；[C，U]纤维制品
processed foods 加工食品
processed adj．(食品)经加工的；加工过的
process vt．加工；处理 n．[C]过程；进程
quantity n．[C，U]数量；数额
dairy products 乳制品
dairy adj．奶制的；乳品(业)的 n．[C]乳制品；乳品店；牛奶厂
as with... 和……一样
moderation n．[U]适度；合理
ideal adj．完美的，理想的；想象的 n．[C]理想；[C，usually sing．]完美的人(或事物)
fundamental adj．根本的；基础的；基本的 n．[usually pl．]基本规律；根本法则
chew vi．& vt．咀嚼；嚼碎 n．[C]咀嚼
end up doing sth． 以做某事告终
digest vt．& vi．消化
consistent adj．一致的；连续的
trick n．[C]诀窍；计谋；把戏
be on the right/wrong track 思路或行为方式正确/错误
It is up to you to do... 由你来决定做……
HEALTHY EATING
There is much debate nowadays as to① what makes up② a healthy diet[1]．For example, scientists have insisted③ for years that a big enemy of health is fatty food④．However, there is increasing evidence that the real driver⑤ of poor health is not so much fatty food[2], as it is[3]sugar．Heart disease is the number one killer of Americans．And in America，people who receive 25% of their daily calories or more through sugar are twice as likely to die from heart disease than people
who receive less than 10% a day (Journal of the American Medical Association⑥， 2014)．This is true regardless of⑦ how healthy the rest of their diet might be．Put more simply，while people continue to argue over⑧whether or not fatty food is dangerous, we already know that sugar is a killer．
Much of this extra sugar comes from sweets and sweet drinks．The average American gets 1/3 of his or her sugar through sweet drinks alone． The American Heart Association recommends that we limit ourselves to⑨less than 100—150 calories a day from sugar, which is less than what is usually contained in one can⑩ of sweet drink or in a single candy bar[4]．In other words, if you want to be healthy, you have to cut down on desserts, and cut out sweet drinks altogether ．
[1]what 引导的宾语从句，作as to的宾语。
[2]that引导的同位语从句，解释说明evidence。
[3]一种语言结构，意为“事实上，实际情况是”，多用来陈述一种原因或状况。
[4]which引导的非限制性定语从句，修饰100—150 calories；其中又包含一个what引导的宾语从句，作less than的宾语。
Beyond this, you can keep healthy by consuming different categories of fresh foods, especially fruit and vegetables, which are full of vitamins and fibre ，rather than processed foods ．
Processed foods often contain less nutrition, and have higher quantities
of sugar, salt, and fat than fresh ingredients．Besides this, it is also important to have some meat，beans, or dairy products in your diet, as they provide the necessary protein for strong bones and muscle growth．As with everything in life, moderation is key．The ideal diet is a balanced one, without too much or too little of any one thing．
Finally, a fundamental key to healthy eating is to eat slowly．It takes about twenty minutes from the time you start eating for your brain to tell your body that you are full．[5]What this means is that people who chew too quickly end up eating too much food because they still feel hungry．[6] Eating slowly also allows your body to digest your food better, and will allow you to enjoy your food more．In addition, studies show that consistent eating habits, for example, taking three meals a day at the same time each day, are better for our health．It is also better to eat a modest amount of food each time, rather than to eat a lot in one meal, and then a little in the next．
[5]“It takes some time for sb．/sth． to do…”句型，意为“做……花费某人/某物多长时间”。you start eating为省略关系词that的定语从句，修饰先行词the time。
[6] What this means is
主语从句
表语从句
There is no one trick to healthy eating．Rather, healthy eating starts with having a healthy attitude towards food．One question you can ask yourself is, “Do I eat to live, or live to eat？” If you are using food mostly for nutrition，then you are on the right track with your diet．However, if food has become the centre of your life, you might be on the road to bad health．It is up to you to decide how you want to live, and to make the right decisions about your diet．
健康饮食
当下，关于健康饮食由什么构成有很多争论。例如，多年来科学家一直坚称健康的大敌是高脂食物。然而，越来越多的证据表明，不良身体状况的真正推手并非过多的高脂食物，而是糖。心脏病是美国人的头号杀手。在美国，每天从糖中摄取25%或更高卡路里的人死于心脏病的可能性是日摄取量少于10%的人的两倍(《美国医学会杂志》，2014年)。无论他们其他方面的饮食多么有益于健康，都确实如此。更简单地说，当人们还在为高脂食物是否有害而争论不休时，我们已经知晓糖是健康杀手。
这些额外的糖大多来自甜食和甜饮料。一个普通的美国人单从甜饮料中摄取的糖就占三分之一。美国心脏协会建议我们将每日糖摄入量限制在100至150卡路里以下，即少于一听甜饮料或一块糖果通常所含的糖。换言之，你要想身体健康，就必须少吃甜点，完全禁饮甜饮料。
除此以外，为了保持身体健康，你还可以食用不同种类的新鲜食物，尤其是富含维生素和纤维素的水果和蔬菜，而不是加工食品。与新鲜食材相比，加工食品通常营养成分较低，糖、盐和脂肪含量更高。此外，在你的饮食中加入一些肉类、豆类或乳制品也十分重要，因为它们为强健骨骼、肌肉生长提供必要的蛋白质。适量是关键，生活中万事皆如此。理想的饮食是均衡饮食，避免过多或过少摄入任何一种东西。
最后，健康饮食的基本要诀是细嚼慢咽。开始进食大约20分钟后，你的大脑才会告知你的身体“你吃饱了”。这意味着咀嚼过快的人最终会吃太多食物，因为他们仍然感到饥饿。细嚼慢咽还能让你的身体更好地消化食物，让你更充分地享受食物。此外，研究表明，有规律的饮食习惯对我们的健康更有好处，例如，每天在固定的时间食用三餐。而且最好每餐摄入适量的食物，而不是上一餐吃得很多，下一餐吃得很少。
健康饮食没有诀窍。更确切地讲，健康饮食始于健康的饮食态度。你可以问自己一个问题：“我是为了活着而吃饭，还是为了吃饭而活着？”如果你吃饭主要是为了汲取营养，那么你已经在饮食方面走对了路子。然而，如果食物已成为你生活的核心，那么你可能已踏上不健康之路。你想如何生活、如何做出正确的饮食抉择，这取决于你自己。
THANKSPeriod 4　 单元语法讲练(Learning About Language)
过去完成时
一、过去完成时的构成
过去完成时由“had done”构成。
Silk had become one of the primary goods traded along the Silk Road by about 100 B.C．
在公元前100年左右，丝绸已经成为“丝绸之路”上交易的主要商品之一。
二、过去完成时的用法
1．表示在过去某一时刻或某个动作之前已经发生或完成的动作或存在的状态。表示的时间是“过去的过去”，这个过去的时刻常用由by，before等引导的短语或时间状语从句来表示，也可以通过一个表示过去的动作或上下文来表示。
The student completed this experiment to make what Professor Joseph had said come true．
为了使约瑟夫教授所说的事情成为现实，这个学生完成了这个实验。
By the end of last year，he had collected more than 100 foreign records．
到去年年底，他已收集了超过100张外国唱片。
2．表示过去某一时刻之前发生的动作或存在的状态一直持续到这一过去时刻，并可能继续下去，常与由for或since引导的表示一段时间的短语或从句连用。
I had been at the bus stop for 30 minutes when a bus finally came．
当一辆公共汽车终于来到的时候，我已在公交车站等了30分钟。
He said that great changes had taken place in his hometown since 1990．
他说自从1990年以来他的家乡发生了很大的变化。
3．want，hope，mean，plan，intend等动词的过去完成时可以用来表示过去未曾实现的想法、希望、打算或意图，意为“本来……”。
They had wanted to help but couldn't get there in time．
他们本来是要去帮忙的，但未能及时赶到那里。
He had hoped to be back last night, but he didn't catch the plane．
他本来希望昨晚回来，但他没赶上飞机。
4．常用过去完成时的固定句型。
(1)在“hardly...when/no sooner...than”句型中，主句用过去完成时，从句用一般过去时。hardly或no sooner位于句首时，句子要用部分倒装结构。
Hardly had we sat down when the phone rang．＝We had hardly sat down when the phone rang．
我们刚坐下电话就响了。
I had no sooner arrived home than it began to rain．＝No sooner had I arrived home than it began to rain．
我刚到家就开始下雨了。
(2)It was the first/second/...time that...句型中的that从句用过去完成时。
It was the first time that I had chatted online in English．
那是我第一次用英语在网上聊天。
[即时训练1]　单句语法填空
①Hardly had I got home ________ it began to rain heavily．
②No sooner had he begun to speak ________ the audience interrupted him．
③It was the second time that she ________ (win) first prize in the physics contest．
④The minute I saw a lady getting off the bus, I knew it was her, for I ________ (see) her before．
⑤I ________ (mean) to see you off, but I was delayed by the jam．
三、过去完成时与一般过去时的用法比较
虽然这两种时态都表示过去发生的动作或存在的状态，但在使用时应注意以下两点不同：
1．过去完成时在时间上强调“过去的过去”，而一般过去时强调过去某一特定的时间。
They had arrived at the station by ten o'clock yesterday．
他们昨天十点就已经到达了车站。
They arrived at the station at ten o'clock yesterday．
他们昨天十点到达了车站。
2．在没有明确地表示过去的时间状语时，谓语动词表示的动作发生的时间先后顺序须依据上下文来判断：先发生的动作用过去完成时，后发生的动作则用一般过去时。
Learning that she had won the prize，her teacher was very pleased．
得知她获奖的消息，她的老师非常高兴。
[即时训练2]　单句语法填空
①When I woke up that morning, it ________ (stop) raining so I could go out as scheduled．
②I knew it was you who ________ (pick) up my schoolbag and handed it in．
③I began collecting stamps in February and by November I ________ (collect) more than 2，000．
④I ________ (hope) to go to your birthday party, but I was too busy．
四、过去完成时的被动语态
过去完成时被动语态的构成：
1．肯定句式：主语＋had been＋过去分词。
The room had been painted twice before she lived in it．
这个房间在她住进去之前已经被粉刷过两次了。
2．否定句式：主语＋had not been＋过去分词。
The room had not been painted before she lived in it．
这个房间在她住进去之前没有被粉刷过。
3．一般疑问句式：Had＋主语＋been＋过去分词？
Had the room been painted before she lived in it
这个房间在她住进去之前被粉刷过吗？
4．特殊疑问句式：疑问词＋had＋主语＋been＋过去分词？
How many times had the room been painted before she lived in it
这个房间在她住进去之前被粉刷过几次？
[即时训练3]　单句语法填空
①Returning to the camp, they were shocked to see everything ________ (ruin)．
②By the time he got to the school, the first period ________ (finish)．
③We went to the playground with the kites which ________ (make) by ourselves．
④The boy was reminded that his homework which ________ (hand) in was not satisfactory．
⑤How many buildings ________ (destroy) when the hurricane ended
短文语境填空
A cow and a fox went out to search for food together． They 1．________ (go) only a few miles before they saw a lion coming their way． They were both very frightened． The fox 2．________ (think) of a way of saving his own life, and went up to the lion and said in his ear，“I 3．________ (help) you get hold of the cow without the trouble of hunting him, if you let me go free．” The lion 4．________ (agree), and the fox then led the cow by a hidden pit(坑), which a hunter 5．________ (dig) as a trap for wild animals，and the cow 6．________ (fall) into it． When the lion saw that the cow 7．________ (catch) and couldn't get away, he 8．________ (turn) his attention to the fox． He soon finished him off, and then 9．________ (go) on to eat the cow．
Betray(背叛) a friend, and you'll often find you 10．________ (destroy) yourself．
第二篇课文(Using Language)
①as to 关于；至于(后可接从句或“疑问词＋不定式”结构)
②make up形成，构成
③insist vt．& vi．坚持说(后跟that从句时，从句用陈述语气)；坚决要求，坚持(后跟that从句时，从句用虚拟语气，即从句谓语用“should＋动词原形”，should可以省略)
④fatty food高脂食物
fatty adj．富含脂肪的；肥胖的；脂肪的
⑤driver n．驱动因素
⑥association n．[C]协会
⑦regardless of不管；不顾
⑧argue over/about...争辩……；为……争论
⑨limit...to...将……限制在……范围内，其被动形式be limited to...也很常用。
⑩can [熟词生义] n．[C]一听(的量)
cut down on 削减，减少
cut out停止做(或使用、食用)；删去
altogether adv．(用以强调)完全，全部；(表示总数或总额)总共，一共
category n．[C]类别；种类
vitamin n．[C]维生素
fibre(US fiber) n．[U]纤维；[C，U]纤维制品
processed foods加工食品
processed adj．(食品)经加工的；加工过的
process vt．加工；处理 n．[C]过程；进程
quantity n．[C，U]数量；数额
dairy products乳制品
dairy adj．奶制的；乳品(业)的 n．[C]乳制品；乳品店；牛奶厂
as with...和……一样
moderation n．[U]适度；合理
ideal adj．完美的，理想的；想象的 n．[C]理想；[C，usually sing．]完美的人(或事物)
fundamental adj．根本的；基础的；基本的 n．[usually pl．]基本规律；根本法则
chew vi．& vt．咀嚼；嚼碎 n．[C]咀嚼
end up doing sth． 以做某事告终
digest vt．& vi．消化
consistent adj．一致的；连续的
trick n．[C]诀窍；计谋；把戏
be on the right/wrong track思路或行为方式正确/错误
It is up to you to do...由你来决定做……
HEALTHY EATING
There is much debate nowadays as to① what makes up② a healthy diet[1]．For example, scientists have insisted③ for years that a big enemy of health is fatty food④．However, there is increasing evidence that the real driver⑤ of poor health is not so much fatty food[2], as it is[3]sugar．Heart disease is the number one killer of Americans．And in America，people who receive 25% of their daily calories or more through sugar are twice as likely to die from heart disease than people who receive less than 10% a day (Journal of the American Medical Association⑥， 2014)．This is true regardless of⑦ how healthy the rest of their diet might be．Put more simply，while people continue to argue over⑧whether or not fatty food is dangerous, we already know that sugar is a killer．
Much of this extra sugar comes from sweets and sweet drinks．The average American gets 1/3 of his or her sugar through sweet drinks alone． The American Heart Association recommends that we limit ourselves to⑨less than 100—150 calories a day from sugar, which is less than what is usually contained in one can⑩ of sweet drink or in a single candy bar[4]．In other words, if you want to be healthy, you have to cut down on desserts, and cut out sweet drinks altogether ．
[1]what 引导的宾语从句，作as to的宾语。
[2]that引导的同位语从句，解释说明evidence。
[3]一种语言结构，意为“事实上，实际情况是”，多用来陈述一种原因或状况。
[4]which引导的非限制性定语从句，修饰100—150 calories；其中又包含一个what引导的宾语从句，作less than的宾语。
Beyond this, you can keep healthy by consuming different categories of fresh foods, especially fruit and vegetables, which are full of vitamins and fibre ， rather than processed foods ．Processed foods often contain less nutrition, and have higher quantities of sugar, salt, and fat than fresh ingredients．Besides this, it is also important to have some meat，beans, or dairy products in your diet, as they provide the necessary protein for strong bones and muscle growth．As with everything in life, moderation is key．The ideal diet is a balanced one, without too much or too little of any one thing．
Finally, a fundamental key to healthy eating is to eat slowly．It takes about twenty minutes from the time you start eating for your brain to tell your body that you are full．[5]What this means is that people who chew too quickly end up eating too much food because they still feel hungry．[6] Eating slowly also allows your body to digest your food better, and will allow you to enjoy your food more．In addition, studies show that consistent eating habits, for example, taking three meals a day at the same time each day, are better for our health．It is also better to eat a modest amount of food each time, rather than to eat a lot in one meal, and then a little in the next．
[5]“It takes some time for sb．/sth． to do…”句型，意为“做……花费某人/某物多长时间”。you start eating为省略关系词that的定语从句，修饰先行词the time。
[6] What this means is
主语从句
表语从句
There is no one trick to healthy eating．Rather, healthy eating starts with having a healthy attitude towards food．One question you can ask yourself is, “Do I eat to live, or live to eat？” If you are using food mostly for nutrition，then you are on the right track with your diet．However, if food has become the centre of your life, you might be on the road to bad health．It is up to you to decide how you want to live, and to make the right decisions about your diet．
健康饮食
当下，关于健康饮食由什么构成有很多争论。例如，多年来科学家一直坚称健康的大敌是高脂食物。然而，越来越多的证据表明，不良身体状况的真正推手并非过多的高脂食物，而是糖。心脏病是美国人的头号杀手。在美国，每天从糖中摄取25%或更高卡路里的人死于心脏病的可能性是日摄取量少于10%的人的两倍(《美国医学会杂志》，2014年)。无论他们其他方面的饮食多么有益于健康，都确实如此。更简单地说，当人们还在为高脂食物是否有害而争论不休时，我们已经知晓糖是健康杀手。
这些额外的糖大多来自甜食和甜饮料。一个普通的美国人单从甜饮料中摄取的糖就占三分之一。美国心脏协会建议我们将每日糖摄入量限制在100至150卡路里以下，即少于一听甜饮料或一块糖果通常所含的糖。换言之，你要想身体健康，就必须少吃甜点，完全禁饮甜饮料。
除此以外，为了保持身体健康，你还可以食用不同种类的新鲜食物，尤其是富含维生素和纤维素的水果和蔬菜，而不是加工食品。与新鲜食材相比，加工食品通常营养成分较低，糖、盐和脂肪含量更高。此外，在你的饮食中加入一些肉类、豆类或乳制品也十分重要，因为它们为强健骨骼、肌肉生长提供必要的蛋白质。适量是关键，生活中万事皆如此。理想的饮食是均衡饮食，避免过多或过少摄入任何一种东西。
最后，健康饮食的基本要诀是细嚼慢咽。开始进食大约20分钟后，你的大脑才会告知你的身体“你吃饱了”。这意味着咀嚼过快的人最终会吃太多食物，因为他们仍然感到饥饿。细嚼慢咽还能让你的身体更好地消化食物，让你更充分地享受食物。此外，研究表明，有规律的饮食习惯对我们的健康更有好处，例如，每天在固定的时间食用三餐。而且最好每餐摄入适量的食物，而不是上一餐吃得很多，下一餐吃得很少。
健康饮食没有诀窍。更确切地讲，健康饮食始于健康的饮食态度。你可以问自己一个问题：“我是为了活着而吃饭，还是为了吃饭而活着？”如果你吃饭主要是为了汲取营养，那么你已经在饮食方面走对了路子。然而，如果食物已成为你生活的核心，那么你可能已踏上不健康之路。你想如何生活、如何做出正确的饮食抉择，这取决于你自己。
Period 4
单元语法
[即时训练1]
①when　②than　③had won　④had seen
⑤had meant
[即时训练2]
①had stopped　②had picked　③had collected
④had hoped
[即时训练3]
①had been ruined　②had been finished　③had been made　④had been handed　⑤had been destroyed
巩固落实
1．had gone　2．thought　3．will help　4．agreed
5．had dug　6．fell　7．had been caught　8．turned　9．went　10．have destroyed
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