1、Section Starting out&Understanding ideas.核心单词1_ n慈善机构2_ adj.一年一度的，每年的3_ v寻找，寻求4_ v量，测量5_ n位置6_ v暴跌7_ n生物8_ n谜charity annual seek measure position crash creature mystery.阅读单词1monarch n_2Atlantic adj._3whale n_4professor n_5per cent n_国王，君主 大西洋的鲸教授 百分比.拓展单词1_ n迁徙_ v迁徙2_ v决定，确定_ adj.有决心的_ n决心3_ adv.终于，
2、最终_ adj.最后的4_ n解决，解决方法_ v解决5_ adj.惊人的，了不起的_ v使惊讶_ adj.感到惊讶的migration migrate determine determined determination eventually eventual solution solve amazing amaze amazed 6_ v破坏，毁掉_ n破坏_ adj.有破坏力的7_ n化学品 adj.化学的_ n化学8_ v幸存_ n幸存者_ n幸存，生存9_ n影响，结果_ v影响destroy destruction destructive chemical chemistrysur
3、vive survivor survivaleffect affect.重点短语1cut down _2in search of _3manage to do _4a solution to._5lead to _砍倒，减少寻找设法做成的解决方法导致；通向.重点句型1One of the most wonderful migrations in nature is _ of the North American monarch butterfly.北美黑脉金斑蝶的迁徙是大自然中最为美妙的迁徙之一。2People _ together to record its migration and ma
4、ke sure that there are enough plants for it to feed on.人们一直齐心协力记录它的迁徙，并确保它有足够的植物可食用。3_ we know about this lovely creature,_ the chance it will survive and keep its place in the natural world for a long time to come.我们对这种可爱的生物了解得越多，它生存的机会以及在很长一段时间内保持它在自然界中的地位就越大。that have been workingThe morethe grea
5、ter.文章整体理解：理清文章架构Animals migration Many animals 1.to find food，find a,partner，or search for warmer weather.One of the most wonderful migrations The North American monarch butterflies 2.,to travel around 4，000 kilometres south to spend,the winter.migrate manage How the monarch butterfly can do it It
6、uses its eyes to 3.the position of,the sun to determine the way and direction.The serious trouble for the monarch butterfly 4.seriously affect the,natural environment for it.What we can doWork together to 5.that they have,a better environment.measureHuman activitiesmake sure.文章细节理解：探寻语篇细节信息1Which of
7、 the following is not the goal of animals migration?ATo find food.BTo find a partner.CTo search for warmer weather.DTo travel.D2Which is not true about the migration of the monarch?AThey have fine black and orange wings.BThey travel about 4,000 kilometres to the north.CThey migrate to find places fo
8、r winter.DThey begin their journey every autumn.B3What is the main idea of Paragraph 3?AHow the monarch migrates.BA team of scientists found the answer.CThe monarch can tell the time of day.DThe sun allows the butterfly to find ways.A4What is the main reason of the falling numbers of the monarch pop
9、ulation?ACutting down trees.BUsing chemicals.CKilling the plants.DHuman activity.D5Which of the following is true according to Paragraph 5?AVolunteers have been working together to feed the butterfly.BThe monarch numbers have increased againCA better understanding of the monarchs behavior is good fo
10、r its survival.DThe monarch butterfly can increase by doing more research.C6You can find the passage in a _.Ascientific paper Btravel bookCpopular nature magazine DnewspaperC第一版块|重点词汇诠释1seek v寻找，寻求seekto do sth.打算/试图做某事after 寻求，追求for 寻找，探求out 找出She managed to calm him down and seek help from a neigh
11、bour.她设法使他平静下来，然后向一位邻居求助。He sought to account for the reason for his failure.他试图解释他失败的原因。He sought for a practical solution to the problem but failed.他寻求解决这个问题的切实办法，但失败了。即学即练 单句语法填空/完成句子(1)He also said he would seek _(reduce)state spending.(2)We are trying to seek _ the trouble spot of the instrumen
12、t.(3)His parents asked why he did not seek _ work.(4)我们决定寻找这些问题的答案。We _ solutions to the problems.to reduceout fordetermine to seek语境助记：He told us that he was going to Beijing to seek his fortune and I suggested that he should seek advice from his teacher and shouldnt seek fame and fortune.他告诉我们他要去北
13、京寻找发财的机会，我建议他应该请教他的老师，不要追名逐利。联想拓展：seek to do sth.试图/设法做某事(但未必做到)try to do sth.attempt to do sth.2.measure v测量(1)measure n措施；方法(2)take measures.采取措施Scientists are trying to measure all the matter in the universe.科学家们正在努力测量宇宙中的所有物质。It measures how much work the team can do.它可以衡量团队完成的工作量。Many people ar
14、e confused about the new ways of measuringtemperature.许多人都搞不清测量温度的新方法。Perhaps whats most important here is that these measures can be changed.也许这里最重要的是这些措施是可以改变的。We must take necessary measures to reduce crime in the area.我们必须采取必要措施来减少这个地区的犯罪。即学即练 单句语法填空(1)The table _(measure)1 metre long.(2)An eart
15、hquake _(measure)6.1 struck California yesterday.(3)We are ready to help all African countries _(采取措施)to reduce the risks of H5N1.measures measuringtake measures名师指津：measure 作“某物有长(宽、高等)”时，为不及物动词，用作定语时常用现在分词的形式。The new bridge,measuring twice as long as the old one，was completed last month.这座新桥是旧桥的两倍
16、长，是上个月完工的。图形助记：The carpenter is measuring the length of the desk.这个木匠正在量这张桌子的长度。3.determine v确定；测定 (1)determine to do sth.决定做某事(表示动作)(2)determined adj.坚决的；有决心的be determined to do sth.决心做某事(表示状态)(3)determination n决心What he believes to be true determines his action.他信之为真的事物决定了他的行为。Authorities are stil
17、l working to determine how much money was lost.有关部门仍在确定具体的损失金额。Chandra was determined to become a doctor.钱德拉决心做一名医生。Carrie went out and there he sat,determining to do something.嘉莉出去了，而他还坐在那里，下定决心要做些事情。即学即练 单句语法填空/完成句子(1)Age and experience will be _(determine)factors in our choice.(2)They have made a
18、 _(determine)effort to stop smoking.(3)他决定给家人一个安全牢固的生活基础。He _ his family a secure and solid base.(4)他们离开村庄，决心再也不回来了。They left their village,_.determining determined was determined to give determined never to come back语境助记：He was a very determined young man who fought the illness with courage and det
19、ermination and was determined to get out of all the bad habits.He thought a decision sometimes could dertermine the future.他是一个很有决心的年轻人，用勇气和决心对抗疾病，并决心改掉所有的坏习惯。他认为一个决定有时会影响未来。4.survive v活下来；幸存 (1)survive from 从存活下来；从流传下来survive on 靠存活下来(2)survivor n幸存者survival n幸存；残存The more we know about these delic
20、ate creatures，the greater the chance they will survive.我们对这些纤弱的生物了解得越多，它们活下来的机会就越大。Every teenager must learn to survive on his own.每个年轻人必须学会依靠自己生存。As long as we are together,we will survive from this storm.只要我们在一起，我们就能从这场风暴中幸存下来。即学即练 用 survive 的适当形式填空(1)There could be two or three of the dolphins le
21、ft in the river，but they have no chance of _.(2)Her father was a _.Her mother had not survived.(3)He _ the earthquake after spending 3 days in an air pocket.survival survivor survived名师指津：survive 的宾语survive 作不及物动词时，后跟介词 from 或 on 构成短语；作为及物动词，表示“幸存”时，宾语为地震、事故、袭击、疾病、霜冻等名词；表示“比某人长命”时，以人作宾语。联想拓展：(1)effe
22、ct 的动词形式为 affect.(2)“对有影响”还可以用：have an impact on.have an influence on.5.effect n影响，结果There is no doubt that“The Belt and Road”Initiative will have a great effect on all the relevant countries.毫无疑问，“一带一路”倡议将会对所有相关国家产生巨大影响。They will feel sleepy in class,which will have bad effects on their memories an
23、d studies.他们课堂上会犯困，这将对他们的记忆力和学业产生坏的影响。These new rules will be brought/carried/put into effect soon.这些新规定将很快付诸实施。An official said the new marriage law took effect on Wednesday.一名官员表示，这项新婚姻法条规于周三生效。即学即练 单句语法填空/完成句子(1)Overusing will have a bad effect _ you and your study.(2)Its hard to believe that som
24、e ancient laws are still _ effect.(3)They did not say when the measure would come _ effect.(4)压力对健康及我们集中精力的能力有重要的影响。_ health and our ability to concentrate.on in into Stress has a major effect on易混辨析：destroy v多指彻底的、毁灭性的破坏，含有不能或很难再修复的意味。damage v.&n多指对价值和功能的破坏，多用于无生命的事物，一般还可以修复。ruin v.&n多指出于外部原因而受到严重破
25、坏以致不能修复，且这种破坏使某物的价值或用处失去。也可用于引申意义，表示希望、愿望的破灭。6.destroy v破坏，毁坏 (1)destruction n破坏(2)destructive adj.毁灭性的A number of paintings in this castle were destroyed in a fire in 2009.这个城堡里的许多油画在 2009 年被一场大火毁掉了。Before the firemen arrived,the whole building had already been completely destroyed in the big fire.
26、在消防队员到达之前，整幢大楼已经在大火中被完全烧毁了。The truck whose engine was damaged yesterday is being repaired in the garage now.昨天发动机坏了的那辆卡车现在正在车库里修理。The rainy weather lasted for a couple of days,completely ruiningour plan for a picnic.持续下了几天雨，这彻底破坏了我们的野餐计划。即学即练 选词填空：destroy/damage/ruin(1)Several houses were slightly(轻
27、微地)_ by the storm in the village.(2)One of my friends asked me to help him with his lessons this weekend,and this _ my plan.(3)Data shows that nearly 19,770 acres(英亩)of the Brazilian rainforests _ between August 2015 and July 2016.damaged ruinedwere destroyed联想拓展：cut down 还有“减少，缩小，削减(开支)”等意思写作佳句：Des
28、erts are also created because people cut down trees and dig up grass.人们伐树掘草，也会造成土壤沙化。第二版块|重点短语、句型剖析1cut down 砍倒；砍掉；削减(1)cut out 裁剪；删去(2)cut in 插嘴，打断(谈话)(3)cut off 打断；停止，中断(供给)；使与外界隔离My uncle hasnt been able to quit smoking，but at least he has cut down.我叔叔还未能戒烟，但至少他已经抽得少了。Cut down on fatty food if yo
29、u want to lose weight.你如果想减肥，就得少吃高脂食物。When their children lived far away from them,these old people felt cut off from the world.当这些老人的孩子们远离他们生活时，他们感到跟这个世界隔绝了。即学即练 用 cut 的相关短语完成句子(1)Was it by _ the number of the staff that she saved the company?No,it was by improving work efficiency.(2)The water supp
30、ly has been _ temporarily because the workers are repairing one of the main pipes.(3)It is impolite to _ when other people are talking.(4)Dont hesitate(犹豫)to _ the useless information in your passage.cutting downcut offcut in cut out2.(教材 P50)One of the most wonderful migrations in nature is that of
31、 the North American monarch butterfly.北美黑脉金斑蝶的迁徙是大自然中最为美妙的迁徙之一。本句是简单句，that 替代的是 One of the most wonderful migrations。当句子中再次出现与前面的名词重复的名词时，常常用 that 代替前面出现的单数可数名词或不可数名词，而用 those 代替前面出现的复数名词。Is the population of Beijing larger than that of Shanghai？北京的人口比上海的人口多吗？The students of our class are more hard-
32、working than those of Class 3.我们班的学生比三班的学生更努力。即学即练 选词填空(that/those/it/one)。(1)In my opinion,the weather in Kunming is more pleasant than _ in Chengdu.(2)I have lost my umbrella;Im looking for _.(3)A chair made of steel is stronger than _ made of wood.(4)His interests are very different from _ of his
33、 firend.that it one those名师指津：替代词 that/one/itthat 只指物，不指人，可替代可数名词或不可数名词，指的是同类事物中另一样东西，即同类异物，复数用 those。one 可指人或物，只替代可数名词，是泛指，复数形式为 ones。it 代替上文提到的名词，指同类事物中的同一物体，复数为 they。3.(教材 P51)People have been working together to record its migration and make sure that there are enough plants for it to feed on.人们
34、一直齐心协力记录它的迁徙，并确保它有足够的植物可食用。本句为复合句，and 连接两个并列的不定式短语作目的状语，that there are.feed on 是 that 引导的宾语从句，have been working 是现在完成进行时。现在完成进行时由“have/has been现在分词”构成，其常见用法如下：(1)表示从过去某时开始一直持续到现在的动作。这个动作可能刚刚停止，也可能继续下去。此时，谓语动词为延续性动词。She has been teaching English since she graduated.她毕业后一直在教英语。I have been waiting for
35、an hour，but she hasnt come yet.我已经等了一个小时了，但是她还没来。(2)表示从过去某时开始到现在的一段时间内反复发生的动作。She has been phoning Jim every night for two weeks.两个星期以来，她每天晚上都给吉姆打电话。(3)表示某种感情色彩。You have been daydreaming but make no efforts.你一直在做白日梦，但从不努力。即学即练 单句语法填空(1)Chinas high-speed railways _(grow)from 9,000 to 25,000 kilometer
36、s in the past few years.(2)Excuse me,which movie are you waiting for?The new Star Wars.We _(wait)here for more than two hours.(3)Nancy doesnt look very well.Whats wrong with her?She has a terrible headache because she _(work)too long.She should stop to have a good rest.have grownhave been waiting ha
37、s been working名师指津：现在完成时表示动作已完成，强调结果；现在完成进行时表示动作的进行，强调动作的持续性。比较：I have written a book.我已经写了一本书。(动作已经完成)I have been writing a book.我一直在写一本书。(动作还将继续下去)4.(教材 P51)The more we know about this lovely creature,the greater the chance it will survive and keep its place in the natural world for a long time to
38、 come.我们对这种可爱的生物了解得越多，它生存的机会以及在很长一段时间内保持它在自然界中的地位就越大。本句为“the比较级(主语谓语)，the比较级(主语谓语)”结构(1)该结构意为“()越，()越”，表示后者随着前者的变化而变化。(2)通常情况下，前一个“the比较级(主语谓语)”相当于条件状语从句，后一个“the比较级(主语谓语)”相当于主句。(3)在表示将来意义的情况下，前者常用一般现在时，后者用一般将来时。The more learned a man is,the more modest he usually becomes.一个人越博学，通常就会变得越谦虚。Its believe
39、d that the harder you work,the better results youll get.人们相信，工作越努力，得到的结果就越好。(4)如果句意明确，该结构常以省略形式出现。The more,the better.多多益善。The sooner,the better.越快越好。即学即练 单句语法填空/完成句子(1)The more fat you take in before bedtime,the _(great)burden(负担)you will put on your body at night.(2)The _(positive)an article,the m
40、ore likely it was to be shared,as Dr.Berger explains in his new book.(3)她对考试越来越有信心了。当然，她学习越努力，考试成绩就越好。She is getting _ confident about the exams and of course,_ she studies,_ results she will get.greater more positivemore and more the harder the better联想拓展：比较级的其他常用结构：(1)比较级and比较级more and more多音节形容词或
41、副词越来越(表示自身程度的改变)With winter coming，the weather is getting colder and colder.随着冬天的到来，天气变得越来越冷。Green products are becoming more and more popular because they are environmentally friendly.绿色产品越来越受欢迎，因为它们环保。(2)the比较级of the two可数名词复数，表示“两者中比较的那一个”。Bob is the taller of the two boys.鲍勃是两个男孩中较高的那个。The Monar
42、chs Journey1 Many animals move from one place to another at certain times of the year.This annual movement is called migration.They migrate to find food，seek a partner，or in search of warmer weather.One of the most wonderful migrations in nature is that of the North American monarch butterfly【1】【1】本
43、句是简单句，句中的 that 作主语，指代的是 one of the most wonderful migrations。2 Every autumn，millions of these beautiful insects with fine black and orange wings begin a long and difficult journey.Somehow they manage to travel around 4,000 kilometres south and find their way to California or Mexico.However,until rec
44、ently no one knew how they did this【2】【2】how they did this 是 how 引导的宾语从句，作 knew 的宾语。3 A team of scientists led by Professor Eli Shlizerman at the University of Washington【3】has now found the answer.They have found out that the monarch is able to tell the time of day.It uses its eyes to measure the p
45、osition of the sun.These two pieces of informationthe time of day and the point where the sun is in the skyallow the butterfly to determine the way to go.【4】Eventually，it manages to reach the places where it will spend the winter【5】【3】led by.Washington 是过去分词短语作后置定语，修饰 A team of scientists。因为 A team
46、of scientists 和 lead 是逻辑上的动宾关系，故这里用过去分词。【4】本句中 the time of day and the point where the sun is in the sky是 information 的同位语，where the sun is in the sky 是 where 引导的定语从句，修饰 the point。【5】where it will spend the winter 是 where 引导的定语从句，修饰先行词 places，where 在从句中作地点状语。4 The solution to the mystery of the mona
47、rchs amazing ability comes at a time when it is in serious trouble【6】.Its population has crashed by as much as 90 per cent in the last few years.Sadly,human activity is the main reasonwhy the number of monarch butterflies is falling【7】.In many of the places where the butterfly can be found,people ar
48、e destroying21 the natural environment.They cut down 22 trees and use chemicals 23 that kill the plants that monarch caterpillars eat【8】【6】when it is in serious trouble 是 when 引导的定语从句，when 在句中作时间状语。【7】why the number of monarch butterflies is falling 是 why 引导的定语从句，why 在句中作原因状语。【8】that kill.eat 是 that
49、 引导的定语从句，修饰先行词 chemicals,that 在该从句中作主语；其中“that monarch caterpillars eat”也是 that 引导的定语从句，修饰先行词 plants，that 在该从句中作宾语。5The research on the monarchs behaviour24 has however led to a greater awareness 25 of this creature 26.People have been working together to record its migration and make sure that ther
50、e are enough plants for it to feed on.【9】If this works,there may come a time when the number of monarch butterflies increases once again.The more we know about this lovely creature，the greater the chance it will survive27 and keep its place in the natural world for a long time to come.【10】【9】本句中 hav
51、e been working 是现在完成进行时，表示动作从过去某时开始，一直延续到现在，还可能延续下去。【10】The more.，the greater.是“the比较级，the比较级”结构，表示后者随着前者的变化而变化。黑脉金斑蝶的迁徙之旅1 许多动物会在一年中的某些时候从一个地方迁移到另一个地方，这种一年一度的运动叫作迁徙。它们迁徙或为了寻找食物，或为了寻找伴侣，或为了寻找更温暖的天气。北美黑脉金斑蝶的迁徙是大自然中最为美妙的迁徙之一。2 每年秋天，数百万只黑脉金斑蝶会开始一段漫长而艰难的旅程。这些漂亮的昆虫翅膀上有着漂亮的黑色和橙色斑纹。不知怎么地，它们设法向南飞行大约 4 000 千
52、米，前往加利福尼亚或墨西哥。但一直到最近，也没有人知道它们是如何做到的。3 华盛顿大学伊莱席里哲曼(Eli Shlizerman)教授领导的科学家(研究)小组现在已经找到了答案。他们发现黑脉金斑蝶可以分辨出一天的时刻。它用眼睛来测量太阳的方位。这两条信息一天中的时刻和太阳在空中的方位让黑脉金斑蝶决定它的路线。最终它成功到达它过冬的地方。4 黑脉金斑蝶遭遇严重困境时它惊人的能力的奥秘才得以解开。过去的几年里，黑脉金斑蝶的数量骤减了百分之九十。不幸的是，人类活动是黑脉金斑蝶数量下降的主要原因。在黑脉金斑蝶生存的许多地方，人们正在破坏自然环境。人们砍伐树木，使用能杀死黑脉金斑蝶幼虫食用的植物的化学药
53、剂。5 不管怎样，对黑脉金斑蝶(迁徙)行为的研究让人们对这种生物有了更多的认识。人们一直齐心协力记录它的迁徙，并确保它有足够的植物可食用。如果这些起作用，那么可能某个时候黑脉金斑蝶的数量会再次增加。我们对这种可爱的生物了解得越多，它生存的机会以及在很长一段时间内保持它在自然界中的地位的机会就越大。词语积累from one place to another 从一个地方到另一个地方annual/njul/adj.一年一度的，每年的annual meeting 年会annual report 年度报告seek/sik/v寻找，寻求in search of 寻找wonderful adj.令人惊奇的，
54、令人赞叹的insect/nsekt/n昆虫somehow/smha/adv.用某种方法，不知怎么地 anyhow adv.无论如何manage v完成(困难的事)，勉力完成 manage to do sth.设法做成某事lead(led，led，leading)v掌管，领导，率领；过(某种生活)vi.导致，造成lead to.导致professor/prfes/n教授measure/me/v量，测量position/pz()n/n位置allow vt.允许 allow sb.to do sth.允许某人做某事allow doing sth.允许做某事be allowed to do sth.被
55、允许做某事allow for 考虑到determine/dtmn，dtmn/v.决定，确定eventually/venli，-li/adv.终于，最终solution/slu()n/n答案，谜底；解决，解决方法a solution to.的解决方法amazing/mez/adj.惊人的，了不起的population n数量，人口carsh/kr/v狂跌，暴跌vi.&vt.(车)碰撞，(飞机)坠毁per cent/psent/n百分比(percent)fifty per cent 百分之五十21destroy/dstr/v破坏，毁掉22cut down 砍倒；减少23chemical/kemk(
56、)l/n化学品 adj.化学的24behaviour/bhevj(r)/n行为，举止behave v表现；表现得体behave oneself 表现良好；行为良好25awareness/wens，wens/n认识，意识26creature/kri/n生物，动物27survive/svav/vi.活下来，幸存 vt.幸存；幸免于难；艰难度过文化采风黑脉金斑蝶(monarch butterfly)呈世界性分布，但主要分布于北美至南美地区。其翅膀为橙色，翅脉为黑色，翅缘的黑色中点缀有两列白色斑点。每年秋季，成千上万的黑脉金斑蝶向南迁移越冬。.单词拼写1They are arguing with th
57、eir classmates about the s_ to the problem.2The big ship was d_ by the iceberg(冰山)and all passengers fell into the river.3I want to thank _(教授)Doris,without whose help I couldnt have made so much progress.4Its _(惊人的)that the small village has changed into a famous tourist city in only ten years.solu
58、tion destroyed Professoramazing 5I bought her a beautiful bag to show my _(感激)of all the help shed given me.6I worked as a _(志愿者)in the 2008 Olympic Games,which is a valuable experience in my life.7Well,Ive found our _(位置)on the map if you want to see where we are.8If people keep polluting the ocean
59、,no creature will _(存活)in the long run.appreciation volunteerposition survive.单句语法填空1Encouraged by a famous dancer,the little girl is _(determine)to do what she is interested in.2One day after school,while _(explore)the green woods of this magnificent mountain,I almost fell on a set of stairs.3He ha
60、d been in hospital for six months.He felt as if he was cut _ from the outside world.4Learning English not only increases my _(aware)of foreign cultures but also helps me to communicate with English-speaking people and make more new friends.5I want to express our _(appreciate)of all the help on behal
61、f of my class.determined exploring offawareness appreciation 6Overfishing and pollution are threatening(威胁)the _(survive)of certain fish species.7I would appreciate _ if Im offered an opportunity to display(展示)my talent.8This is the third time he has been praised for his _(volunteer)work for the Red
62、 Cross.No wonder he is so excited!9The temperature now is much higher than _of 100 years ago because of more and more greenhouse gases.10Hi,Andrew.How can you improve your English so much?Oh,its nothing difficult.The _(hard)you work at it,the more progress you will make.survival it voluntary that ha
63、rder.完成句子1你总是设法在错误的时间做错误的事情。You always _ wrong things at the wrong time.2主席说，“请允许我向大家介绍我的女儿。”“_ my daughter to you，”said the president.3我无法肯定地告诉你什么时候我能到。I cant tell you with certainty when I am _.4饮酒太多就很容易导致严重的麻烦！Too much wine can easily _ serious trouble!5在离开这儿之前，一定要弄明白自己的药该怎么吃。_ you understand exa
64、ctly how to take your medicines before you leave here.manage to doAllow me to introduce able to arrivelead to Make sure.课文语法填空Every autumn,millions of the North American monarch butterflies 1._(begin)a long and difficult journey.Somehow they manage to travel around 4,000 kilometres south and find th
65、eir way to California or Mexico.However,until recently no one knew how they did this.A team of scientists 2._(lead)by Professor Eli Shlizerman has now found the answer.They have found out that the monarch is able to tell the time of day.3._ uses its eyes to measure the position of the sun.These two
66、pieces of information allow the butterfly 4._(determine)the way to go.Finally,it manages to reach the places where it will spend the winter.begin led It to determine5_(sad),human activity is the main reason 6._ the number of monarch butterflies is falling.In many of the places where the butterfly ca
67、n be found.people are destroying the 7._(nature)environment.They cut down trees and use chemicals that kill the plants that monarch caterpillars eat.The research on the monarchs behaviour has however led to a greater 8._(aware)of this creature.People have been working together to record its migration and make sure that there are enough plants for it to feed 9._.If this works,there may come a time when 10._ number of monarch butterflies increases once again.Sadly why natural awareness onthe