Lesson 3 Ships in the Desert 高级英语第一册ppt课件.ppt

Warm-up Discussion1. List the environmental problems existing on our planet and give examples of human activities that affect the environment  deforestation, acid rain, salinification of soils, waste gas emission, disposal of batteries, contamination of underground aquifers, ozone depletion, oil spills, species extinction, desertification, loss of ecological balance, global warming ( greenhouse effect)… Understanding of the Text Typical examples of destruction Para 1 the Aral Sea the fourth-largest inland sea in the world ten years agoHot dry sand now Para 2 3 Trans-Antarctic Mountains (South Pole) The enormous change in the global atmosphere is still picking up speed. Para 4 5 Arctic Ocean (North Pole) polar air warms; the ice will thin because of global warming. Para 6 Equator (midway between the two poles) Understanding of the Text Typical examples of destruction Para 7＆8 Noctilucent Cloud Para 9－15 Humankind’s assault on the earth: some images Para 16－end The dominant cause of change in the global environmenthuman civilization The real solution reinvent and finally heal the relationship between civilization and the earth Para. 1 the Aral Sea Question for Para. 1 What turned the most productive fishing site into a hot dry sand?　（Why is the Aral disappearing?） an ill-considered irrigation scheme It is becoming smaller and smaller because the water that used to flow into the sea has been turned away to irrigate the land created in the desert to grow cotton. The scheme was an ill-considered one because it failed to take into consideration the ecological effect. The Aral Sea Language Points in Para. 1 （the Aral Sea） 1. … the prospects of a good catch looked bleak. It was not at all possible to catch a large amount of fish. This is obviously an understatement because with sand all around there was no chance of catching fish, to say nothing of catching a lot of fish. The future of this firm will be ve