【正文】 anywhere in the world in just a few hours. Out of the three experimental HyperX aircrafts built for NASA5, only one is now left. The agency has plans for another 11second hypersonic flight, this time at 10 times the speed of the sound. 詞匯： hypersonic /?ha?p??s?n?k/ adj. 超音速的 booster /?bu:st?/ n. 助推器 equator /???we?t?(r)/ n. 赤道 milestone /?ma?lst??n/ n. 里程碑 unmanned /??n?m?nd/ adj. 無人的 booster rocket 助推火箭 scramjet /?skr?md?et/ n. 超音速燃燒沖壓式 , cargo /?k?:???/ n. 貨物 噴氣發(fā)動機(jī) brink /br?? k/ n. 邊 緣 bustion /k?m?b?st??n/ n. 燃燒 注釋： 1. Hyper: 構(gòu)詞詞素，意思是：超，極度的；例如： hypersonic (超音速 )， hyper text （超文本）， hyperactive（極度活躍）。 5． B 這個句子的字面意思是：如果你終于得到這樣的背包，過馬路時一定要兩面都看看。 A、 C、D 在文中均未提到。 spring 是一個多義詞：泉水（ A）、春天（ B）、彈跳（ C）。 練習(xí)： 1. Backpacks are convenient because A) they can be very large B) they can hold as many things as you want to carry. C) your hands are freed to do other things. D) you do not have to carry things with you. 2. What is the most important feature of the backpack invented by Lawrence C. Rome and his colleagues? A) It produces electricity for electronic devices while the wearer walks. B) It can be used as cell phones, GPS in the military actions or field studies. C) It is small and convenient. D) It is light and easy to carry. 3. The word “springs” in Paragraph 3 means A) a small stream of water flowing naturally from the earth. B) the season of the year, occurring between winter and summer. C) the act or an instance of jumping or leaping. D) a length of metal wound around, which returns to its original shape after being pushed. 4. According to Paragraph 4, what does Rome plan to do? A) To make the backpack more fortable for the wearer. B) To put the backpack on the market. C) To test the advantage of the backpack. D) To promote the backpack in a newspaper or on television. 5. What is implied in “if you do get one eventually, just make sure to look both ways before 8 / 43 環(huán)球外語在線（ ） 京城首家基于 2020 年新版職稱英語教材的網(wǎng)絡(luò)輔導(dǎo)課程全面上線 地址 :北京市海淀區(qū)中關(guān)村南大街甲 18 號北京國際 D 座 8 層 郵編 :100081 Email: 客服咨詢熱線： 01062126633 或 4006783456 轉(zhuǎn) 601/602/604/605/607/608/609 傳 真： 01062168398(直撥 ) crossing the street!” A) You will be too excited to watch the traffic. B) Enjoying electronic devices while walking may invite traffic accidents. C) It is not possible for you to get such a backpack. D) It is wise of you to have such a backpack. 答案與題解： 1. C 第一段告訴我們，因?yàn)楸嘲梢匝b許多東西，所以可以將雙手解放出來做其它事情：to free your hands to do other things. 2. A 第二段的第一句說， Lawrence C. Rome 及其同事們發(fā)明的這種背包，當(dāng)背著背包走路時，會有電能產(chǎn)生；該段最后一句告訴我們，背包的這種性能可減少背包的重量，因?yàn)椴槐財y帶備用電池。 5. global positioning system (GPS)： 全球定位系統(tǒng) 6. Science： 美國的 Science 雜志為國際上著名的自然科學(xué)綜合類學(xué)術(shù)期刊，在世界學(xué)術(shù)界享有盛譽(yù)。 6 / 43 環(huán)球外語在線（ ） 京城首家基于 2020 年新版職稱英語教材的網(wǎng)絡(luò)輔導(dǎo)課程全面上線 地址 :北京市海淀區(qū)中關(guān)村南大街甲 18 號北京國際 D 座 8 層 郵編 :100081 Email: 客服咨詢熱線： 01062126633 或 4006783456 轉(zhuǎn) 601/602/604/605/607/608/609 傳 真： 01062168398(直撥 ) 1. Electric Backpack (C 級 ) （替換 2020 年用書理工類閱讀理解第二 篇 ： Will Quality Eat up the US Lead in Software? ） Backpacks are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you don’t mind carrying a heavy load, your backpacks might also power your MP31 player, keep your cell phone running, and maybe even light your way home. Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia2 and the Marine Biological Laboratory in Woods Hole3, Mass. 4, have invented a backpack that makes electricity from energy produced while its wearer walks. In military actions, searchandrescue operations, and scientific field studies, people rely increasingly on cell phones, global positioning system (GPS)5 receivers, nightvision goggles, and other batterypowered devices to get around and do their work.. The backpack’s electricitygenerating feature could dramatically reduce the amount of a wearer’s load now devoted to spare batteries, report Rome and his colleagues in the Sept. 9 Science6. The backpack’s electricitycreating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearer’s back, and the whole pack moves up and down as the person walks. A gear mechanism converts vertical movements of the pack to rotary motions of an electrical generator, producing up to watts. Unexpectedly, tests showed that wearers of the new backpack alter their gaits in response to the pack’s oscillations, so that they carry loads more fortably and with less effort than they do ordinary backpacks. Because of that surprising advantage, Rome plans to mercialize both electric and nonelectric versions of the backpack. The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. For the rest of us, powergenerating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the same time. Electricitygenerating packs aren’t on the market yet, but if you do get one eventually, just make sure to look both ways before crossing the street! 詞匯： backpack /?b?kp?k/ watt /w?t/ n. 瓦（特） receiver /r??si?v?/ n. 接收機(jī) gait /?e?t/ n. 步態(tài)，步法 nightvision goggle 夜視鏡 oscillation /??s??le???n/ n. 擺動 spring /?pr?? / n. 彈簧 mercialize /k??m????la?z/ v. 商業(yè)化 vertical /?v????k?l/ adj. 垂直的 mountaineer /?ma?nt??n??/ n. 登山運(yùn)動員 7 / 43 環(huán)球外語在線（ ） 京城首家基于 2020 年新版職稱英語教材的網(wǎng)絡(luò)輔導(dǎo)課程全面上線 地址 :北京市海淀區(qū)中關(guān)村南大街甲 18 號北京國際 D 座 8 層 郵編 :100081 Email: 客服咨詢熱線： 01062126633 或 4006783456 轉(zhuǎn) 601/602/604/605/607/608/609 傳 真： 01062168398(直撥 ) rotary /?r??t?r?/ adj. 旋轉(zhuǎn)的 注釋： 1. MP3 ： Inter 上最流行的音樂格式，最早起源于 1987 年德國一家公司的 EU147 數(shù)字傳輸計劃，它利用 MPEGAudioLayer3 的技術(shù)，將聲音文件用 1∶ 12 左右的壓縮率壓縮，變成容量較小的音樂文