托福寫作優(yōu)秀范文欣賞四

來源：中華考試網(wǎng)發(fā)布時(shí)間：2011-11-22

    Electricity

    The modern age is an age of electricity. People are so used to electric lights， radio， televisions， and telephones that it is hard to imagine what life would be like without them. When there is a power failure， people grope about in flickering candlelight， cars hesitate in the streets because there are no traffic lights to guide them， and food spoils in silent refrigerators.

    Yet， people began to understand how electricity works only a little more than two centuries ago. Nature has apparently been experimenting in this field for million of years. Scientists are discovering more and more that the living world may hold many interesting secrets of electricity that could benefit humanity.

    All living cell send out tiny pulses of electricity. As the heart beats， it sends out pulses of record； they form an electrocardiogram， which a doctor can study to determine how well the heart is working. The brain， too， sends out brain waves of electricity， which can be recorded in an electroencephalogram. The electric currents generated by most living cells are extremely small - often so small that sensitive instruments are needed to record them. But in some animals， certain muscle cells have become so specialized as electrical generators that they do not work as muscle cells at all. When large numbers of these cell are linked together， the effects can be astonishing.

    The electric eel is an amazing storage battery. It can seed a jolt of as much as eight hundred volts of electricity through the water in which it live. （An electric house current is only one hundred twenty volts.） As many as four-fifths of all the cells in the electric eel‘s body are specialized for generating electricity， and the strength of the shock it can deliver corresponds roughly to length of its body.

    更多托福考試寫作輔導(dǎo)

    托�？荚噦淇�11月招生中，點(diǎn)擊報(bào)名

    報(bào)名熱線：010-51260174

• 閱讀上一篇：托福寫作優(yōu)秀范文欣賞三
• 閱讀下一篇：托福寫作優(yōu)秀范文欣賞五

外語項(xiàng)目推薦

報(bào)名推薦熱線：010-51294614、51299614

機(jī)構(gòu)優(yōu)惠

報(bào)名推薦熱線：010-51294614、51299614

[an error occurred while processing this directive]

育路版權(quán)與免責(zé)聲明

① 凡本網(wǎng)注明稿件來源為"原創(chuàng)"的所有文字、圖片和音視頻稿件，版權(quán)均屬本網(wǎng)所有。任何媒體、網(wǎng)站或個(gè)人轉(zhuǎn)載、鏈接轉(zhuǎn)貼或以其他方式復(fù)制發(fā)表時(shí)必須注明"稿件來源：育路網(wǎng)"，違者本網(wǎng)將依法追究責(zé)任；

② 本網(wǎng)部分稿件來源于網(wǎng)絡(luò)，任何單位或個(gè)人認(rèn)為育路網(wǎng)發(fā)布的內(nèi)容可能涉嫌侵犯其合法權(quán)益，應(yīng)該及時(shí)向育路網(wǎng)書面反饋，并提供身份證明、權(quán)屬證明及詳細(xì)侵權(quán)情況證明，育路網(wǎng)在收到上述法律文件后，將會(huì)盡快移除被控侵權(quán)內(nèi)容。