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.
预告片:美国动作片-《弯刀Machete》
哈利波特主题公园开门迎客 影片主创到场助兴
好莱坞恐怖片12大绝色美女主角
《暮色3:月食》发新照 热恋情侣成双入对
《变形金刚3》新片场照 高挑罗茜性感装亮相
暑期档:十部即将引爆的重磅影片
2010年暑期档最值得影迷期待的十大影片
那些美貌与智慧并存的美女演员兼导演
《变形金刚3》新女主角锁定内衣名模 英女王远亲挑战梅根
2010不可错过的八部动画大片
《歪小子斯科特》七个“邪恶前男友”曝光
对时尚界产生巨大影响的9部经典电影
《绯闻女孩》制片方:可能会有中国版《绯闻女孩》
8国影坛8个代表美女的8种美
"暮光女"携"狼人"到韩
《绯闻女孩》片场潮人聚集 梅斯特中性莱弗利性感
安吉丽娜.朱莉想退出娱乐圈 表白称爱布拉德全部
《降世神通:最后的气宗》片花“火与冰”
好莱坞重点大片齐聚动漫展 看点预告全面前瞻
《八卦天后》莉顿-梅斯特新片剧照曝光
《哈7》曝首款海报+新预告
七部不可思议的经典爱情电影
新蜘蛛侠人选敲定 《男孩A》主演脱颖而出
《欢迎来到利雷家》预告 斯图尔特演脱衣舞女
新月获2010MTV电影颁奖礼年度最佳影片
满足女人对爱情所有幻想的7部电影
10部经典电影让你看透女人心
《暮光之城》角色造型揭密 设计灵感来自于原著
《玩具总动员3》曝新片段 海量花絮揭秘幕后
《变形金刚3》芝加哥片场照 新汽车人神秘现身
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |