(
课件网) Unit 4 The Earth Key question Why should we learn about the Earth What is it It has no smell. It has no taste. But when the wind blows, You feel it on your face. It’s air. Why do we need air We need air to breathe /bri: /. . When air flows over a warm surface, it heats up and rises. This leaves room for cooler air to flow in. The flowing air is _____. What is it wind Discussion What is air, and what do you know about it What is wind What can it do How can we tell the direction of the wind Before you read Air has no smell. Air has no taste. But when the wind blows, You feel it on your face. Look at that kite, Or the plane over there. How do they stay up They ride on the air. How does that balloon, Float in the sky Well, it’s simply hot air, That makes balloons fly! We need air to breathe. We need air to survive. And when we breathe it, It keeps us alive. —What is a common feature of poems Which can you see in this poem —Rhymes /ra mz/ 押韵 /e / /a / /a v/ The second and fourth line of each verse(诗节) rhyme. /e / Read and appreciate (1) How can you describe air (2) What do the sentences “We need air to breathe. We need air to survive. ” mean (3) Clean air is very important. Is there a lot of air pollution where you live Read and Think (1) Why can clouds move (2) What thing(s) can we use to use to tell the direction of the wind (3) What do you know about wind power Read and Think (1) Air has no _____ and no _____. (2) A kite or a plane _____ to stay in the sky. (3)“We need air to survive” means “air _____ us _____”. (4) The wind moves clouds across the sky, and sometimes these clouds bring in _____. (5) A(n) _____can tell us where the wind is blowing from. (6) _____ produce electricity for us. Comprehension exercise smell taste rides on the air keeps alive rain weathercock Windmills Think and talk: What do you know about the sea How much of the Earth is covered by the sea What is the biggest animal in the sea Is there any sunshine at the bottom of the sea How deep is the deepest part of the sea How many big oceans are there on Earth Before you listen 1 Only about _____ of the Earth is land. a. 3/4 b. 1/4 2 Most of the water on Earth is in _____. a. streams and rivers b. the sea 3 Whales _____ fish. a. are b. are not 4 Sharks are _____. a. small b. dangerous 5 _____ catch fish for people to eat. a. Fishermen b. Farmers 6 Sea water usually tastes _____. a. sweet b. salty 7 People _____ drink sea water. a. can b. cannot Quiz Before you listen coral reefs disappearing rising sea levels plastic pollution overfishing Prediction: What are likely to be mentioned Get ready for the language plastic pollution coral reefs disappearing rising sea levels overfishing While-listening Tips: 1. Before you listen, read the instructions and the options carefully. 2. During the listening task, listen out for the options. Listen to a quiz about the sea and tick the problems that the speakers ment ... ...
