[读《从字词学习抵达阅读理解》一文有感]在周一贯先生主编的《小学语文文体教学大观》一书中，我读到了莫国夫的一篇文章，心中颇受触动。文中指出： 小学阅读教学承担着识字学词的功能，同时这又是一个双向互动的过程，即识...+阅读
Invisibility Ring
Scientists can’t yet make an invisibility cloak1 like the one that Harry Potter2 uses．But，for the first time，they’ve constructed a simple cloaking device that makes itself and something placed inside it invisible to microwes．
When a person “sees” an object，his or her eye senses many different wes of visible light as they bounce off the object．The eye and brain then work together to anize these sensations and reconstruct the object’s original shape． So，to make an object invisible，scientists he to keep wes from bouncing off it．And they he to make sure the object casts no shadow．Otherwise，the absence of reflected light on one side would give the obiect away．
Invisibility isn’t possible yet with wes of light that the human eye can see．But it is now possible with microwes．Like visible light，microwes are a form of radiant energy．They are part of the electromagic spectrum，which also includes radio wes，infrared light，ultriolet rays，X rays，and gamma rays．The welengths of microwes are shorter than those of radio wes but longer than those of visible light．
The scientists’ new “invisibility device” is the size of a drink coaster and shaped like a ring．The ring is made of a special material with unusual ability．When microwes strike the ring，very few bounce off it．Instead，they pass through the ring，which bends the wes all the way around until they reach the opposite side．The wes then return to their original paths．
To a detector set up to receive microwes on the other side of the ring，it looks as if the wes never changed their paths as if there were no object in the way! So，the ring is effectively invisible．
When the researchers put a small cdpper loop inside the ring，it，too，is nearly invisible． However，the cloaking device and anything inside it do cast a pale shadow．And the device works only for microwes，not for visible light or any kind of electromagic radiation．So，Harry Potter’s invisibility cloak doesn’t he any real petition yet．
词汇：
invisibility/ invizE5biliti / n．看不见，无形 spectrum/ 5spektrEm / n．光谱
cloak / klEuk / 斗篷，披风 infrared/ 5infrE5red / adj．红外线的
microwe / 5maikrEuweiv/ n．微波 ultriolet ray 紫外线
reconstruct / 5ri:kEn5strQkt / v．重建 gamma ray 伽马射线
radiant / 5reidjEnt / adj．辐射的 welength/ 5weivleNW / n．波长
electromagic/ IlektrEJ5mA^nItIk / adj．电磁的coaster/ 5kEustE(r)/ n．托盘，垫子
练习：
1． Harry Potter is mentioned in the passage，because scientists
A can now make an invisible cloak of the same kind as he uses．
B try to make an invisible cloak of the same kind as he uses．
C try to invent a device Similar in idea to the invisible cloak he uses．
D know that it is possible to make an invisible cloak of the same kind．
2． What is true of microwes?
A Their welengths are shorter than those of visible light．
B Their welengths are longer than those of visible light．
C They are different from visible light as they are a kind of radiant energy．
D They are visible to the human eye．
3． What is NOT true of the invisibility device?
A It is made of a special material with unusual ability．
B Microwes bounce off it when they strike it．
C Microwes pass through it when they strike it．
D It bends the microwes all the way around until they reach the opposite side．
4． What does the word “coaster” mean in the passage?
A A disk or plate placed under a drinking glass to protect a table top．
B A vessel engaged in coastal trade．
C A roller coaster．
D A resident of a coastal area．
5． Harry Potter’s invisibility cloak doesn’t he any real petition yet，because
A scientists he not found out how his cloak works．
B the cloaking device is a total failure．
C the cloaking device works only for microwes．
D the cloaking device works only for visible light．
参考答案:
1. C 文章的第一段告诉我们，科学家还没有发明哈里·波特使用的那种隐身衣，所以不能选 A；该段还告诉我们，科学家已制造了，一种装置，这种装置能使自身或置于其中的物体不被微波发现，所以C是正确选择，也就是说，科学家发明的隐形装置和哈里波特的隐身衣仅仅在概念上相同，这同时说明B和D是错误的选择。
2． B 第三段最后一句中告诉我们，A是错误选择，B是正确选择。该段第三句说，微波与可见光一样都是一种辐射能，所以C的说法是错误的，不能选择；根据该段第一句：with wes of light that the human eye can see和第三句：Like visible light，可以得知D是错误的说法，也不能选择。
3． B 第四段第三句说，当微波到达装置表面时，very few bounce off。very few是几乎没有的意思，所以选择B。其他选择所述内容都可以很容易在该段中找到。
4． A 第四段第一句告诉我们，科学家的这个隐形装置和一个杯垫差不多大小，所以A是正确选择。coaster是一个多义词，其他几个选择是该词的其他意思，B：从事沿海贸易的船；C：过山车，摩天轮；D：海岸地区居民。
5． C A句在短文中没有提到；按文章的内容B不是正确的说法；文章最后一段说，And the device works only for microwes，not forvisible light，所以C是正确选择。
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