<p>音频：3a循环听，Peppa pig</p><p>理解性阅读: ORT 8.4-6</p><p>指读：ORT 8.4-6</p><p>Video: curious George</p><p>复述：ORT7-13 the power cut</p><p>experiment：where the water goes</p><p>supplementary：what is capillary</p><p>supplementary: the structure of leaf</p><p>中文：第三册第五、六单元，古诗一首</p><p>数学： 练习除法</p> <p>复述：ORT7-13 the power cut</p> <p>M: let’s do an experiment.</p><p>E: ok!</p><p>M: we are going to see how water goes into a plant. Would you like to see this?</p><p>E: yes, i want to see.</p><p>M: good. So we will get a cabbage leaf and cut it up the middle. We will put a piece into each glass with water and food dye. Then we’ll see the water move up the plant. </p><p>E: ok! I want to put the piece of cabbage into the water.</p><p>M: ok, now let’s leave them for a while, we’ll check them later.</p> <p>Material: 4 beakers, 4 pieces of cabbage( two fresh leaves, two dry leaves), food coloring, knife, straw, water, salt, preservative film</p><p>实验目的：1. 毛细作用是否可使叶子根部的水分到达叶子远端。</p><p> 2. 分别选用干叶和新鲜叶子，观察叶子本身不同的水分比例是否会对叶子的吸水性有影响。</p><p> 3. 分别用盐水和清水，观察不同的液体对叶脉管壁的吸引力是否不同以致影响叶子的吸水性。</p><p><br></p> <p>Step: 1. Cut off the skin of cabbage.</p><p>2. Pour 50 ml water in each beaker.</p><p>3. Label the 4 beakers from number 1-4.</p><p>4. Drop several drips of red food coloring in the first and second beaker and add the salt into this two beakers. drop several drips of purple food coloring in the third and fourth beaker.</p><p>5. Put the 4 pieces of cabbages separately into 1-4 beakers( one fresh leaf in number 1 red salt water, one dry leaf in number 2 red salt water, one fresh leaf in number 3 purple water, one dry leaf in number 4 purple water) . Prepare 4 pieces of preservative films and cut a hole in each piece to let the cabbage go through. Cover the beakers with preservative film to avoid evaporations.</p> <p>Wait.......</p> <p>Result: number 1 fresh leaf is all colored with red salt water, so does number 2 dry leaf. number 3 fresh leaf is all colored with purple water, so does number 2 dry leaf. </p><p><br></p> <p>结论： 1. 叶脉可通过毛细作用将水分从叶根部吸引至叶子远端。</p><p>分析 1. 因为放置时间过长，叶子远端全部染色，无法区分盐水和清水的吸附能力区别。</p><p> 2. 因为放置时间过长，叶子远端全部染色，无法区分新鲜叶子和干叶之间吸水能力的区别。</p><p>需改进：1. 应该根据时间段来观察叶子颜色变化并做记录。</p><p> 2. 色素家的不够多，染色效果不是很明显，下次需要改进</p> <p>discuss: what is capillary</p><p>Capillary action (sometimes capillarity, capillary motion, capillary effect, or wicking) is the ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity. The effect can be seen in the drawing up of liquids between the hairs of a paint-brush, in a thin tube, in porous materials such as paper and plaster, in some non-porous materials such as sand and liquefied carbon fiber, or in a biological cell. It occurs because of intermolecular forces between the liquid and surrounding solid surfaces. If the diameter of the tube is sufficiently small, then the combination of surface tension (which is caused by cohesion within the liquid) and adhesive forces between the liquid and container wall act to propel the liquid.</p> <p>The structure of leaf</p>