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.
如何突破英语口语
如何用语调判断说话人的意思
真正提高英语听力的八点建议《听力方法》
雅思听力:怎么掌握雅思听力中的词汇衔接
白领必看:实用外企office常用英语
托福听力指导:分类词汇之植物学
专家支招:练好英语口语的“锦囊妙计”
雅思听力考试的特点和学习方法
人家问“最近怎么样”时如何回答
翻译答案(2)
雅思听力指南:如何突破雅思听力瓶颈
名师:你该掌握的“英语谚语佳句汇总”(A部分)
翻译答案
托福听力:听力中那些听不懂的小词小句
2012年六级秘笈:英语六级听力正确答案的特征
领会英语口语中的“INPUT”
名师:你该掌握的“英语谚语佳句汇总”(N部分)
提高英语口语的六大妙招
托福听力主要题型及解题要点
漂亮口语,源自“热情”
雅思听力技巧:好习惯能有效提高雅思听力成绩
2011秋季基础口译名师点睛:Short conversation 全攻略(1)
雅思听力技巧辅导:从语调猜意思
词汇的差别:英式英语Vs美式英语
经验交流:提高英语听力的小窍门
2011秋季基础口译名师点睛:听译备考策略
如何做好托福听力:技巧总结-Process
新托福听力常见失分点
新东方名师:中高级口译口语话题之交通状况
提高英语听力的六种方法
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |