Unit 13 The water planet教學(xué)設(shè)計

now let’s look at this map and then answer the following questions:
 can you tell what map it is? where is it?
 is the water here salty or fresh?
 what’s the place called where river and the ocean meet?
step 2. while-reading
1. skimming
1). find out the definition of estuary.
 (an estuary is the body of water where a river meets the ocean. salt water from the ocean and fresh water from the river mix together in an estuary. this mixing of fresh and salt water creates a unique environment filled with life of all kinds---- a zone between the land and sea.)
2). what functions of estuaries have been mentioned in the passage?
   (great places for nature’s young animals clean our water by absorbing nutrients and pollutants from water coming from inland sources; provide both recreation and education for human beings.)
3). text analysis:ask ss to make an analysis of the main reading text—nature’s nursery: estuaries
check the answers:
part 1. estuary is our planet’s nursery
part 2. estuaries are great places for nature’s young creatures
part 3. they help clean our water.
part 4. they provide recreation and education for human beings.
ask ss to make an analysis of the main reading text—life in the ocean
2. scan the passage and answer the following questions.
1). why are estuaries such good places for nature’s young ones?
 (in estuaries, animals can enjoy all the benefits of the oceans without having to face many of its dangers. tides provide energy for the ecosystems, but estuaries are protected from waves and storms by islands, mud or sand. nutrients from both the land and the ocean arrive in estuaries.)
2). what does “density” mean in this passage?
 (it means the degree to which an area is filled with things or people.)
3). how do estuaries affect the water that passes through them?
 (they absorb nutrients and pollutants from water coming inland sources, thus cleaning our water.)
4). why are estuaries more sensitive to pollution than other areas?
 (because estuaries act as filters(過濾器), many pollutants end up in them.)
5). why are estuaries important to human beings?
 (estuaries provide both recreation and education for human beings. for example, people can fish, swim and have fun on the beach; scientists and students have endless opportunities to study a variety of life in the habitat. estuaries also contribute to the economy through tourism and fishing.)
step 3. language points
paragraph two
1. benefit
1) vt. “對…有利”, 后面接名詞&代詞, 但不接反身代詞