Invisibility Ring　　Scientists cant yet make an invisibility cloak1 like the one that Harry Potter2 uses.But，for the first time，theyve constructed a simple cloaking device that makes itself and somethingplaced inside it invisible to microwaves.　　Invisibility isnt possible yet with waves of light that the human eye can see.But it is nowpossible with microwaves.Like visible light，microwaves are a form of radiant energy.Theyare part of the electromagnetic spectrum，which also includes radio waves，infrared light，ultraviolet rays，X rays，and gamma rays.The wavelengths of microwaves are shorter thanthose of radio waves but longer than those of visible light.　　To a detector set up to receive microwaves on the other side of the ring，it looks as if thewaves never changed their paths as if there were no object in the way! So，the ring is effectively invisible.　　練習(xí)：　　Acan now make an invisible cloak of the same kind as he uses.　　Ctry to invent a device Similar in idea to the invisible cloak he uses.　　2.What is true of microwaves?　　BTheir wavelengths are longer than those of visible light.　　DThey are visible to the human eye.　　AIt is made of a special material with unusual ability.　　CMicrowaves pass through it when they strike it.　　side.　　AA disk or plate placed under a drinking glass to protect a table top.　　CA roller coaster.　　5.Harry Potters invisibility cloak doesnt have any real competition yet，　　Ascientists have not found out how his cloak works.　　Cthe cloaking device works only for microwaves.　　答案與題解：　　2.B第三段最后一句中告訴我們，A是錯誤選擇，B是正確選擇。該段第三句說，微波與可見光一樣都是一種輻射能，所以C的說法是錯誤的，不能選擇;根據(jù)該段第一句：with wavesof light that the human eye can see和第三句：Like visible light，可以得知D是錯誤的說法，也不能選擇。　　4.A第四段第一句告訴我們，科學(xué)家的這個隱形裝置和一個杯墊差不多大小，所以A是正確選擇。coaster是一個多義詞，其他幾個選擇是該詞的其他意思，B：從事沿海貿(mào)易的船;C：過山車，摩天輪;D：海岸地區(qū)居民。

　　Invisibility Ring　　Scientists cant yet make an invisibility cloak1 like the one that Harry Potter2 uses.But，for the first time，theyve constructed a simple cloaking device that makes itself and somethingplaced inside it invisible to microwaves.　　Invisibility isnt possible yet with waves of light that the human eye can see.But it is nowpossible with microwaves.Like visible light，microwaves are a form of radiant energy.Theyare part of the electromagnetic spectrum，which also includes radio waves，infrared light，ultraviolet rays，X rays，and gamma rays.The wavelengths of microwaves are shorter thanthose of radio waves but longer than those of visible light.　　To a detector set up to receive microwaves on the other side of the ring，it looks as if thewaves never changed their paths as if there were no object in the way! So，the ring is effectively invisible.　　練習(xí)：　　Acan now make an invisible cloak of the same kind as he uses.　　Ctry to invent a device Similar in idea to the invisible cloak he uses.　　2.What is true of microwaves?　　BTheir wavelengths are longer than those of visible light.　　DThey are visible to the human eye.　　AIt is made of a special material with unusual ability.　　CMicrowaves pass through it when they strike it.　　side.　　AA disk or plate placed under a drinking glass to protect a table top.　　CA roller coaster.　　5.Harry Potters invisibility cloak doesnt have any real competition yet，　　Ascientists have not found out how his cloak works.　　Cthe cloaking device works only for microwaves.　　答案與題解：　　2.B第三段最后一句中告訴我們，A是錯誤選擇，B是正確選擇。該段第三句說，微波與可見光一樣都是一種輻射能，所以C的說法是錯誤的，不能選擇;根據(jù)該段第一句：with wavesof light that the human eye can see和第三句：Like visible light，可以得知D是錯誤的說法，也不能選擇。　　4.A第四段第一句告訴我們，科學(xué)家的這個隱形裝置和一個杯墊差不多大小，所以A是正確選擇。coaster是一個多義詞，其他幾個選擇是該詞的其他意思，B：從事沿海貿(mào)易的船;C：過山車，摩天輪;D：海岸地區(qū)居民。