广西高二英语《unit13 the properties of waterintegrating》课件 新人教版

Integrating Skills o Natures Nursery: Estuaries 1 Find the definition of an estuaryFind the definition of an estuary An estuaryAn estuary is the body of water where a river is the body of water where a river meets the ocean. Salt water from the ocean meets the ocean. Salt water from the ocean and fresh water from the river mix together in and fresh water from the river mix together in an estuary. This mixing of fresh and salt water an estuary. This mixing of fresh and salt water creates a unique environment filled with life of creates a unique environment filled with life of all kindsall kindsa zone between the land and sea. a zone between the land and sea. 2 Structure of the passage 1 1 2 2 4 4 3 3 1 1 2 2 4 4 3 3 1 1 2 2 3 3 4 4 Main idea of the passage: Estuaries are the nursery for life in the oceans and rivers. 更多资源 3 Questions : 1)Why are estuaries such good places for natures young one? 2)What does density mean in this passage? 3)How 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? 4 Q1: Because the habitat provides all the benefits of the ocean(energy and nutrients)without the dangers (waves and storms). Q2: “Density “ 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. 5 Q4: Since estuaries act as filters,many pollutants end up in the estuaries. Q5: Estuaries are important to human beings because we like to study and relax in them and because they contribute to the economy through tourism and fishing. 6 Language points 1.provide sth. for sb. 提供某物给某人 provide sb. with sth 把某物提供给某人 We provide food for the hungry children. = We provide the hungry children with food. 我们应该为受害者(sufferers)提供钱和帮助。 We should provide money and help for the sufferers. We should provide the sufferers with money and help. 7 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 各种各样的 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 预防 赡养 规定 8 Fill the blanks Estuaries are the areas _ a river meets the ocean. It is a transition zone between _ water and _ water . Many species live in the 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 also 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 _. where freshsalt provide tide nutrients variety reproduce protective Why do so many species live in estuaries? 9 Write your own paragraphs 10 Topic: _ Step 1: Step 2: Step 3: What will happen if you put an ice cube into water? Describe what happens Describe the causes and effects The conclusion An explanation paragraph (说明文) 11 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 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. 12 If you are describing a process, If you are describing a process, l l You should explain each step in the order it You should explain each step in the order it happens. happens. l l Tell the readers about the causes and effects and Tell the readers about the causes and effects and use words like use words like first, second, then,first, second, then, etc to show the etc to show the order of the steps. order of the steps. First First Second Second Third/ Then Third/ Then Last Last 13 If you are writing about something that has If you are writing about something that has several parts, describe each part and explain its several parts, describe each part and explain its function and structure.function and structure. The following questions may help: The following questions may help: l l What is it ? How many parts is it made up of? What is it ? How m