廣西欽州市高二英語(yǔ)《Unit 13 The properties of waterintegrating》課件 新人教版

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1、Integrating SkillsIntegrating SkillsoNatures Nursery: EstuariesStructure of the passage Main idea of the passage:Estuaries are the nursery for life in the oceans and rivers. 更多資源更多資源 Questions :1)Why are estuaries such good places for natures young one?2)What does density mean in this passage?3)How

2、do estuaries affect the water that passes through them?4) Why are estuaries more sensitive to pollution than other areas?5) Why are estuaries important to human beings?Q1: Because the habitat provides all the benefits of the ocean(energy and nutrients)without the dangers (waves and storms).Q2: “Dens

3、ity “ means the number of species per area in this passage.Q3: Estuaries absorb nutrients and pollutants from water coming from inland sources,thus cleaning our water.Q4: Since estuaries act as filters,many pollutants end up in the estuaries.Q5: Estuaries are important to human beings because we lik

4、e to study and relax in them and because they contribute to the economy through tourism and fishing.Language points 1.provide sth. for sb. 提供某物給某人提供某物給某人 provide sb. with sth 把某物提供給某人把某物提供給某人 We provide food for the hungry children.= We provide the hungry childrenwith food. 我們應(yīng)該為受害者我們應(yīng)該為受害者(sufferer

5、s)提供錢和幫助。提供錢和幫助。 We should provide money and help for the sufferers. We should provide the sufferers with money and help. You had better provide against typhoon. Its the youths duty to provide for the olds.The rules in school provide that the students should respect the teachers.2. a variety of sth

6、各種各樣的各種各樣的 The shopping-centre sells a variety of goods. Children do badly at school for a variety of reasons.3. contribute to prep 有助于，促使有助于，促使預(yù)防預(yù)防贍養(yǎng)贍養(yǎng)規(guī)定規(guī)定Fill the blanksEstuaries are the areas _ a river meets the ocean. It is a transition zone between _ water and _ water . Many species live in the

7、 estuaries because they _ energy, nutrients, and shelter from the dangers of the open sea. The energy in the estuaries comes from the _ , which is calmer and safer than the waves and winds of the open ocean. Since rivers meet the sea in estuaries, _ come from both the land and the ocean. Estuaries a

8、lso provide shelter: islands, mud, and sand form a _ wall against many of the dangers of the open oceans. The safe and nutrient-rich environment attracts a _ of species. Some live here all the time, others come to estuaries to feed and _.wherefreshsaltprovidetidenutrientsvarietyreproduceprotectiveWh

9、y do so many species live in estuaries?Write your own paragraphsWrite your own paragraphsTopic: _Step 1: Step 1: Step 2: Step 2: Step 3:Step 3:What will happen if you put an ice cube into water? Describe what happensDescribe the causes and effects The conclusionAn explanation paragraph (說(shuō)明文說(shuō)明文)Sampl

10、e writing:Sample writing: The reason an ice cube floats is the way the density of the water changes with temperature. Density is the relationship between mass and volume. It is measured in kilogrammes per cubic metre. A substance with lower density will stay on top of, or float on, a substance with

11、higher density. The density of pure water is 1,000 kg/m3,so if a substance has a higher density, for example 2,000 kg/m3, it will sink. If the density is lower , say 500 kg/m3, it will float on the water. The density of water decreases when water freezes. That means that an ice cube has lower density than water. Thus /Therefore, an ice cube will float.