最新201X版 Unit 4 Period Ⅰ 单元预习课

1、Unit 4Exploring plantsPeriod单元预习课植物是我们生活中必不可少的一个部分，那么你知道植物的重要性吗？Plants form the basic food staple for all life forms.They are the major source of food and oxygen on earth，since no animal can supply these necessary components without plants.There are many different types of cash crops that produce mo

2、ney for farmers.Olive oil comes from olives，corn oil comes from corn，and peanut oil comes from peanuts.Typical agricultural products like corn，wheat，rye，and rice are all considered cash crops.Coffee plants produce beans that are used to make coffee；coca plants give us chocolate；vanilla plants grow l

3、ong thin beans that are used to produce vanilla flavoring.Plants are also used in agriculture to helpanting trees in a row prevents the wind from blowing away the valuable topsoil.In the forest，trees act as shelter for many organisms.Plants are also important for the overall ecology of an area.Roots

4、 help to stabilize soil and prevent the soil erosion by water runoff.Plants are also important in our atmosphere because they use carbon dioxide and give off oxygen while they undergo photosynthesis.Plants are also used in the urban setting to reduce noise，produce shade，and to beautify an area.Trees

5、 add value to homes and communities.Plants are essential to the balance of nature and in people's lives.Green plants，i.e.，those possessing chlorophyll(叶绿素)，produce their own food and give off oxygen in the process called photosynthesis (光合作用)，in which water and carbon dioxide are combined by the

6、 energy of light.Plants are the ultimate source of food and metabolic energy for nearly all animals，which cannot produce their own food.Besides foods，plant products vital to humans include wood and wood products，fibers，drugs，oils，latex，pigments，and resins.Coal and petroleum (石油) are fossil substance

7、s of plant origin.Thus plants provide people not only sustenance but shelter，clothing，medicines，fuels，and the raw materials from which innumerable other products are made.1What is the purpose of the second paragraph?_2Why are plants important to our atmosphere?_【答案】1.Give some examples about the use

8、 of plants.2Because they use carbon dioxide and give off oxygen while they undergo photosynthesis.根据词性及英文释义写出单词的正确形式1_adj.far away in space or time2_nbalance for weighing；one of the two pans on a balance；relative size，extent，scope，etc.3_nstruggle，fight；disagreement4_neffort；attempt to do sth.new or

9、difficult5_adj.fixed，fastened or drawn together firmly6_nact of putting a limit on sb./sth.7_nquality of speaking，writing in an easy smooth manner8_vi.to be attractive or interesting (to sb.)【答案】4endeavour短语填空date back to；on a large scale；come across；quantities of；fail to；take interest in；result in；

10、appeal to1They are preparing for war _2Stress and tiredness often _ a lack of concentration.3Does the idea of working for IBM _ you?4This castle _ Roman times.5Small _ poison were detected in the dead man's stomach.【答案】1.on a large scale2.result in3.appeal to4.dates back to5.quantities of背诵下列教材中

11、出现的句型，体会黑体部分的用法1The plants in our gardens look so familiar that often we do not realize that many of them actually come from countries far away.我们花园的植物看上去如此熟悉，以至于我们常常意识不到其中许多实际上来自于遥远的国家。2However, it was not until the eighteenth and nineteenth centuries that the exploration of the botanical world beg

12、an on a large scale.然而，直到18世纪和19世纪人们对植物世界的大规模探索才开始。3Not only did Fortune introduce over 120 species of plants to Western gardens but he also shipped 20，000 tea plants from Shanghai to India，where a successful tea industry was established.福琼不仅把120余种植物引入西方园林，而且还把两万株茶树用船从上海运到了印度，印度的制茶工业就成功地发展起来了。从三个选项中

13、选择最佳答案1The first recorded plant exploration happened_.Ain the 18th centuryBabout 1，500 years agoCabout 1500 BC2Who is not a collector mentioned in the passage?AFather d'Incarville.BThe Queen of England.CRobert Fortune.3Plants collectors met many difficulties EXCEPT_Alack of moneyBthe conflicts w

14、ith local peopleCrestrictions on the movement of Europeans4Which of the following statements is TRUE according to the text?AThe first plant collecting expedition dated back to 1500 AD.BE H Wilson discovered the Dove Tree among the western plant collectors.CThe second half of the nineteenth century w

15、as a very important period of plant exploration.5What's the text mainly about?ATransporting plants over a long distance was a big problem.BThere was a lot of plant collecting in the 18th and 19th centuries.CMany plant collectors were sent to a collecting trip to China.【答案】完成下列表格TimePeople/Plants

16、Historic EventsIn 1500 BCthe Queenof Egyptsent ships to 1._，animals and other goods2._Father d'Incarvillewas sent to BeijingIn 1751the Tree of 3._arrived in EnglandIn 1769Sir Joseph Bankscollected plants in 4._In 5._the Tree of Heavenwas introduced in 6._In 1833Robert Fortunemade several trips t

17、o ChinaDuring the second half of the 19th centurymany Catholic missionarieswere sent to China from 7._8._Father Fargessent seeds of Dove Tree from China to FranceIn 18999._collected a large quantity of the seeds of 10._ in China【答案】1.gather plants2.In the 1740s 3Heaven seeds4.Australia5.17846.North

18、America7.France8.In 18979.E H Wilson10.the Dove Tree完成下面课文缩写send；exciting；conflict with；that；date back；quantities of；however；until；face；beginThe plants look so familiar 1._we often don't know that many of them are from countries far away，which 2._to the earliest times.Many plants collectors realized the value of the plants from distant lands.3._，the exploration of the botanical world didn't 4._on a large scale 5._the 18th and 19th centuries.Of course，they had many difficulties in the trips，6._many dangers including disease，near­starvation，severe environments