人教版高中英语课件：unit 13 interating skills.ppt

integrating skills o natures nursery: estuaries skim and find out the main top sentences task one activity 1activity 1. . finding topic sentences topic sentence of paragraph: _ sentence: as the oceans are the source of life on earth, as the oceans are the source of life on earth, the estuaries are our planets nurseries.the estuaries are our planets nurseries. topic sentence of paragraph: _ sentence: estuaries are great places for natures young ones. estuaries are great places for natures young ones. topic sentence of paragraph: _ sentence: estuaries are also important because they absorb estuaries are also important because they absorb nutrients and pollutants from water coming from nutrients and pollutants from water coming from inland sources, thus cleaning our water.inland sources, thus cleaning our water. topic sentence of paragraph: _ sentence:estuaries provide both recreation and education estuaries provide both recreation and education for human beings.for human beings. 3 3 2 2 4 4 1 1 activity 2activity 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 task two: 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 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: “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. 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. task three: write your own paragraphs topic: _ step 1: step 2: step 3: what will happen to a piece of metal if you put it in water? describe what happens describe the causes and effects the conclusion sample writing: if a piece of metal,or any other object is put in water ,it will dissolve. because the water molecule is made up of one oxygen and two hydrogen atoms. it is polar,that is, it has a slightly negative and a slightly positive end. the two ends m