職稱英語考試?yán)砉ゎ愰喿x理解專項(xiàng)訓(xùn)練

雕龍文庫 分享 時(shí)間: 收藏本文

職稱英語考試?yán)砉ゎ愰喿x理解專項(xiàng)訓(xùn)練

  Sugar Power for Cell Phones  Using enzymes commonly found in living cells,a new type of fuel cell produces small amounts of electricity from sugar.If the technology is able to succeed in mass production,you may some day share your sweet drinks with your cell phone.  When researchers previously used enzymes in fuel cells,they had trouble keeping them active,says Shelley D.Minteer of St Louis University1.Whereas biological cells continually produce fresh enzymes,theres no mechanism in fuel cells to replace enzymes as they quickly degrade.  In the new fuel Cell,tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes.When glucose from a sugary liquid gets into a pocket,the enzyme oxidizes it,releasing electrons and protons.The electrons cross the membrane and enter a wire through which they travel to the other electrode,where they react with.oxygen in the atmosphere to produce water.The flow of electrons through the wire constitutes an electrical current that can generate power.  Sugar-eating fuel cells could be an efficient way to make electricity.Sugar is easy to find. And the new fuel cells that run on it are biodegradable,so the technology wouldnt hurt the environment.The scientists are now trying to use different enzymes that will get more power from sugar.They predict that popular products may be using the new technology in as little as 3 years.  A When enzymes can be commonly found in living ceils.  C When the technology of a new type of fuel cell is suitable for mass production.  2. What trouble did Minteer and Klotzhach have in their research?  B They had trouble keeping biological cells active.  D They had trouble finding mechanism for producing enzymes.  A when bags of enzyme are embedded in the new fuel cell.  C when the enzyme oxidizes the glucose from a sugary liquid that goes through  D when the enzyme oxidizes the sugary liquid that goes through a pocket.  A Their limitless power generation capacity is amazing.  C Their limited power generation capacity is the result of great efforts.  5. According to the last paragraph,what is NOT true of the new fuel cells?  B The new fuel cells are environment friendly.  D It will take some time before the new fuel cells can be used in popular products.

  

  Sugar Power for Cell Phones  Using enzymes commonly found in living cells,a new type of fuel cell produces small amounts of electricity from sugar.If the technology is able to succeed in mass production,you may some day share your sweet drinks with your cell phone.  When researchers previously used enzymes in fuel cells,they had trouble keeping them active,says Shelley D.Minteer of St Louis University1.Whereas biological cells continually produce fresh enzymes,theres no mechanism in fuel cells to replace enzymes as they quickly degrade.  In the new fuel Cell,tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes.When glucose from a sugary liquid gets into a pocket,the enzyme oxidizes it,releasing electrons and protons.The electrons cross the membrane and enter a wire through which they travel to the other electrode,where they react with.oxygen in the atmosphere to produce water.The flow of electrons through the wire constitutes an electrical current that can generate power.  Sugar-eating fuel cells could be an efficient way to make electricity.Sugar is easy to find. And the new fuel cells that run on it are biodegradable,so the technology wouldnt hurt the environment.The scientists are now trying to use different enzymes that will get more power from sugar.They predict that popular products may be using the new technology in as little as 3 years.  A When enzymes can be commonly found in living ceils.  C When the technology of a new type of fuel cell is suitable for mass production.  2. What trouble did Minteer and Klotzhach have in their research?  B They had trouble keeping biological cells active.  D They had trouble finding mechanism for producing enzymes.  A when bags of enzyme are embedded in the new fuel cell.  C when the enzyme oxidizes the glucose from a sugary liquid that goes through  D when the enzyme oxidizes the sugary liquid that goes through a pocket.  A Their limitless power generation capacity is amazing.  C Their limited power generation capacity is the result of great efforts.  5. According to the last paragraph,what is NOT true of the new fuel cells?  B The new fuel cells are environment friendly.  D It will take some time before the new fuel cells can be used in popular products.

  

信息流廣告 競(jìng)價(jià)托管 招生通 周易 易經(jīng) 代理招生 二手車 網(wǎng)絡(luò)推廣 自學(xué)教程 招生代理 旅游攻略 非物質(zhì)文化遺產(chǎn) 河北信息網(wǎng) 石家莊人才網(wǎng) 買車咨詢 河北人才網(wǎng) 精雕圖 戲曲下載 河北生活網(wǎng) 好書推薦 工作計(jì)劃 游戲攻略 心理測(cè)試 石家莊網(wǎng)絡(luò)推廣 石家莊招聘 石家莊網(wǎng)絡(luò)營銷 培訓(xùn)網(wǎng) 好做題 游戲攻略 考研真題 代理招生 心理咨詢 游戲攻略 興趣愛好 網(wǎng)絡(luò)知識(shí) 品牌營銷 商標(biāo)交易 游戲攻略 短視頻代運(yùn)營 秦皇島人才網(wǎng) PS修圖 寶寶起名 零基礎(chǔ)學(xué)習(xí)電腦 電商設(shè)計(jì) 職業(yè)培訓(xùn) 免費(fèi)發(fā)布信息 服裝服飾 律師咨詢 搜救犬 Chat GPT中文版 語料庫 范文網(wǎng) 工作總結(jié) 二手車估價(jià) 情侶網(wǎng)名 愛采購代運(yùn)營 情感文案 古詩詞 邯鄲人才網(wǎng) 鐵皮房 衡水人才網(wǎng) 石家莊點(diǎn)痣 微信運(yùn)營 養(yǎng)花 名酒回收 石家莊代理記賬 女士發(fā)型 搜搜作文 石家莊人才網(wǎng) 銅雕 關(guān)鍵詞優(yōu)化 圍棋 chatGPT 讀后感 玄機(jī)派 企業(yè)服務(wù) 法律咨詢 chatGPT國內(nèi)版 chatGPT官網(wǎng) 勵(lì)志名言 兒童文學(xué) 河北代理記賬公司 教育培訓(xùn) 游戲推薦 抖音代運(yùn)營 朋友圈文案 男士發(fā)型 培訓(xùn)招生 文玩 大可如意 保定人才網(wǎng) 黃金回收 承德人才網(wǎng) 石家莊人才網(wǎng) 模型機(jī) 高度酒 沐盛有禮 公司注冊(cè) 造紙術(shù) 唐山人才網(wǎng) 沐盛傳媒