LessonKeeptheCandleBurning!.ppt

a candle a candleholder light (lit, lighted / lit, lighted) 点燃，使燃烧 burn (burned, burnt/ burned, burnt) 燃烧 a big glass jar Think about it. What makes the candle burn? Oxygen 氧气 make/let sth./sb. do 使某物/某人做……. eg: Let the candle burn for two or three minutes. I make the student go out. Why did the candle stop burning?Is there any oxygen in the jar? use up eat up drink up eg:I have used up the water in the bottle. He has eaten up the bread. She has drunk up the water. Did the water rise  half of the jar ? half: half a year = a half year half an hour Let’s do some math exercises Task : Let’s speak English Work in groups, do the experiment by yourselves. Then describe the steps and the conclusion of the experiment in English . （以小组形式做实验，并用英语叙述实验步骤和结论。） * * * * * * * * * Lesson 30 Keep the Candle Burning! 袁隆平 Yuan Longping He was burn in 1930. He came up with an idea for a hybrid rice in the 1960s. His dream is to grow a new type of rice that would be as big as a peanut. What do we need to do the experiment? a match matches a shallow dish with water How to do the experiment? 1) Put the candle in the candleholder. 2) Put the candleholder in the dish. 3) Fill the dish half full of water. 4) Light the candle. 5) Let the candle burn for two or three minutes. 6) Carefully put the jar over the candle until the top of the jar rests on the dish. 7) Look at the water in the jar. one-fifth 1 2 1 5 1 3 1 4 3 4 How far did the water rise? 分子基，分母序，分子 1 ,分母加 S three fourths three quarters one (a) quarter one fourth one third a (one) half one second (one-second) 1 3 + = 1 3 two thirds 1 4 + = 2 4 three-fourths 1 5 + = 1 5 two fifths 1 5 + = 2 3 thirteen-fifths candle candleholder dish fill half light burn uses burning up Read the text and fill in the blacks. Let’s do an experiment. First find a and then put it in the