血液四級英語作文

　　Blood

　　What is blood? It is the red liquid which comes out of your finger when you cut it because of not being careful.There are about 13 pints (品脫) of blood in a man＇s body. He can give a pfnt of blood at a time to a blood bank for the use o other man who may need it. A healthy body makes up the pint of blood quickly.

　　What does our blood do for us? It takes food to all parts of our bodies and takes waste away from them. All the parts of our bodies are made up of cells, these cells, which are very small, all need food all the time. The blood is like a stream.The cells take what they need out of the blood stream, as plants and fishes take their food out of water.The blood stream carries food and the oxygen which it has taken up in our lungs to all the cells in the body.

　　What makes the blood go on moving round the body in a stream? The heart sends it round. The heart keeps a stream of blood going all around the body and back again to itself. Everywhere the blood stream does two things: supplies the cells with food and oxygen and takes away waste. It is as if the blood kept the little fires in cells burning and took away the ashes.

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　　這篇說明文向我們描述了血液是什么，血液的作用以及是什么促使血液循環(huán)于我們?nèi)�身。讀者可將此文作為背景知識來學(xué)習(xí)。

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　　血液

　　什么是血?血就是當(dāng)不小心割破了手指時，從中流出的紅色的液體。人體內(nèi)大約有13品脫血液。他可以一次獻給血庫1品脫血。而這些血對于一個身體健康的人來說，很快就可以補充上。

　　血是做什么用的?它將食物送到我們身體的各個部分，然后又將其中的廢物排出。我們體內(nèi)的各個系統(tǒng)都是由細胞組成的'。這些微小的細胞總是需要食物。血液就像一條小溪。這些細胞，就象植物和魚從水中提取食物一樣，從血液中提取它所需要的食物。血液將這些食物以及從肺中提取的氧轉(zhuǎn)送到體內(nèi)各個器官的細胞中。

　　是什么使得血液在體內(nèi)四處活動?是心臟。是心臟使血液在體內(nèi)循環(huán)。每到一處，血液要做兩件事：供給食物和氧，排出廢物。好像是血液使得體內(nèi)的小火一直燃燒著，然后又將燒過的灰排出。

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