When you get to the beach, the sand and the rocks are so hot that they hurt your bare feet. You put on sneakers in a hurry. The water is so bright and shining in the sun that you can hardly look at it. While the charcoal (木炭) fire is starting to burn in the cookout stove, every one goes for a swim. The water feels goodwarm at the top, but cooler down around your toes.
A little wind is blowing when you come out. The fire isnt quite ready for cooking yet, so you play tag or read.
For lunch there are hot dog, corn, salad and rolls, sodas, fruit, and coffee for the adults. By the time the coffee water boils and the corn and hot dogs are cooked, all the bathing suits are dry. So are the towels spread out on the rocks, in the sun.
Lunch is good. Just as you are finishing, it starts to rain so you pack up and run. But nobody minds the rain. It will cool things off.
At the same time you were having fun at the beach, work was being done. Energy from the sun was doing work. Energy, in one form or another, does all the work in the world.
Heat energy from the sun dried the towels. It heated the sand and the rocks, the water and the air. It even made the rain and the wind. Heat from the sun does small work and big work, all over the earth.
Light energy from the sun was working on the beach too. It supplied the daylight.
It lit the earth and made the sand bright and the water sparkling.
The sun also supplied the energy that grew the food you ate.
Plants use light energy from the sun to make food for themselves. The food is a kind of sugar. It is also a kind of energy called chemical energy. Green plants change light energy from the sun into chemical energy.
Plants use some of that energy for everyday living and growing. They store the rest in their leaves and seeds, in fruit, roots, stems, and berries.
The salad and the corn, the rolls, fruit, and coffee all came from plants. You and all animals depend on plants for food.
The charcoal you used for cooking began as a plant too. Once, that charcoal was a living tree that used sunlight to make food and then stored part of the food it made. The energy in this stored food remained, even after the tree died. You used that energy when you burned the charcoal.
一年级英语上册Unit1 My classroom第三课时教案
上海牛津版一年级英语Unit2 Small animals第四课时教案
一年级英语上册教案 Unit 1 第二课时
上海牛津版一年级英语下册教案Unit9 Revision(3)
一年级英语Module1 unit6 Mid-Autumn Festival教案
一年级英语教案Module1 unit6 Mid-Autumn Festival
沪教牛津版小学英语一年级上册 Unit 3 第二课时教案
沪教版小学英语一年级下册教案unit1课时3
小学一年级英语下册Unit2 Small animals教案1
上海牛津版一年级英语Unit3 This is my mum教案
外研版一年级英语上册教案Unit1 Hello
沪教牛津版小学英语一年级上册 Unit3 period1教案
沪教牛津版一年级英语上册教案Unit1 My classroom第二课时
上海牛津版一年级英语下册Unit2 Small animals教案
牛津版一年级英语上册unit5 Fruit教案(1)
一年级英语上册教案 Unit 1 Period 1
沪教牛津版小学英语一年级上册 Unit 8 教案
上海版牛津一年级英语教案Unit8 Playtime(总五课时)
沪教版小学英语一年级下册教案unit1课时6
一年级英语上册教案 Unit1My classroom 第三课时
上海牛津版一年级英语Unit7 My family教案
上海牛津版一年级英语下册Unit3 Colours教案(1)
牛津版一年级英语上册教案Unit4 My bag第一课时
上海版牛津一年级英语教案 Unit 3 My abilities
一年级英语上册教案Unit1 My classroom第一课时教案
沪教牛津版小学英语一年级上册 Unit3 period2教案
沪教版小学英语一年级下册教案unit1单元分析
上海牛津版一年级英语Unit 9 Revision单元分析教案
新课标小学英语第一册期末考试百词范围
苏教版牛津小学一年级英语教案Unit1 What`s your name
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |