【正文】 ri sed to fi nd that these di nosaurs coul d not onl y run l i ke the others but al so clim b trees. They l earned thi s from the way the bones were joi ned together. Di nosaurs di ed out suddenl y about 65mi l i on years ago. Som e sci entists think i t cam e after an unexpected i nci dent when a huge rock from space hi t the earth and put to m uch dust i nto the ai r. O thers thi nk the earth got too hot for the di nosaurs to li ve on any m obody knows for sure why and how di nosaur di sappeared from the earth i n such a short tim e. We know m any other wil d pl ants, anim al s,i nsects and birds have di ed out m ore recently. Accordi ng to a UN report , som e 844 anim al s and pl ants have disappeared i n the l ast 500 years. The dodo i s one of them . It l i ved on the Isl and of Mauriti us and was a very fri endl y anim al .Pl ease l i sten to a story of the dodo and how it di sappeared from the earth. (3) The return of the mi l u deer My nam e i s Li nhui .I l i ke to tel l stori es about peopl e who work i s even better i s when countri es hel p each other and buil d a good fri endshi p. An excel l ent exam pl e of thi s happened when Bri tai n and Chi na worked together to bri ng the Mil u deer back to Chi na. The Mil u deer, a speci es wi th large horns, used to be m on i n Chi na l ong ke other deer they li ve together and eat grass and the soft parts of trees such as smal branches. Mi l u deer were often hunted for food or sport i n the past. The , Mi ng and Qi ng dynasti es di d not protect them and m any were kil l ed. That is how the Mi l u deer di sappeared from Chi na. Lucki l y before al l of them were ki l ed,some were taken to Bri tain to im prove the envi ronm ent of the beauti ful park whi ch bel onged to the Duke of Bedford. H e li ked them so m uch that he took them al l the way from Chi na to Bri tai n. The Mil u der l i ked the cool , wet weather i n Engl and and thei r num ber i ncreased year by year. As a result, when in 1985 the governm ent of Chi na wanted to rei ntroduce the Mil u deer,the Duke of Bedford was happy to hel p. The fi rst deer cam e back to Chi na to the N anhai zi Mil u Park 20 ki l om eters south of Bei ji ng and the centre i n Dafeng, Ji ngsu Provi nce. The deer centai nl y seem happy to be back i n Chi na because thei r num bers have grown rapi dl y. There are now so m any of them that a new park has been opened for them i n H ebei Province. At the mom ent the Mil u der l ive i n centres where they are bei ng 一、全冊教材分析 六年級第二學期是小學階段最后一個學期，教材從促進學生的發(fā)展，為學生進入第三學段的學習打好基礎出發(fā)，把六年級（下冊）的教學內容分成兩部分編排。比例的知識有比例的意義、比例的基本性質和解比例。圓柱與圓錐是本冊教材的又一個重點內容，包括圓柱和圓錐的形狀特征，圓柱的表面積及計算方法，圓柱和圓錐的體積及計算方法等知識。 “ 空間與圖形 ” 領域里的內容分圖形的認識、圖形的變換、圖形的位置 三個部分進行復習。根據《標準》里具體目標的設計分類，在 “ 數與代數 ”領域里把內容分成數的運算、數的認識、式與方程、正比例與反比例四個部分進行復習。本冊 教材繼續(xù)教學轉化，讓學生進一步體會和應用，通過具體的轉化活動，發(fā)展思維的靈活性。教學正比例和反比例，著重理解正比例的意義和反比例的意義，讓學生在現實的情境中作出相應的判斷。在前二個單元里教學新知識，全面完成《標準》規(guī)定的第二學段的教學內容和具體目標。這些知識有助于理解圖形的放大與縮小，能用來解決有關比例尺的問題。圖形的放大和縮小是小學數學新增加的教學內容，讓學生初步了解圖形可以按一定的比例發(fā)生大小變換。小學階段的測量主要是線段的長度、圖形的面積、物體的體積，教材把測量的內容與圖形的認識有機結合起來，能提高復習的效率。 總復習的內容也按四個領域編排。對于轉化思想，學生在前面的學習中已經有較豐富的體驗。是本冊教材的重點內 容之一。在總復習里重點地系統復習小學階段教學的主要知識，在深化理解的同時組織更合理的認知結構，通過適當的練習形成必要的技能，應用知識解決實際問題，培養(yǎng)數學素養(yǎng)。在解決問題的策略里，教學轉化的思想和方法。這個內容安排在第三單元里，結合比例的知識進行教學。 “ 統計與概率 ” 領域的內容分統計、可能性兩個部分進行復習。教材嚴格遵照《標準》的要求，精選傳統小學數學里有關形體的知識，增加與生活密切聯系的空間知識，讓學生在獲得必需的數學事實的過程中發(fā)展空間觀念。所以，轉化是重要的認知策略，也是常用的解決問題策略。 “ 數與代數 ” 領域：比例的有關知識，成正比例和成反比例的量，解決問題的策略。 新授內容仍然分二個領域安排。轉化能使復雜的問題變得簡單，能把未知的內容變成已知的內容。確定位置也是新增的教學內容，在初步認識方向的基礎上，用 “ 北偏東幾度 ”“ 南偏西幾度 ” 的形式量化描述 物體所在的具體方向，還要聯系比例尺的知識，用 “ 距離多少 ” 的形式描述物體所在的位置。在總復習里還安排了上述三個領域內容的綜合應用，分別研究住房面積的變化、旅游費用的預算、調查周any longer. However, this reali ty al so worri ed m y desi gners. As ti me went by, I was m ade sm al er . First as a PC(personal puter)and then as a l aptop, I have been used i n offi ces and hom es si nce the 1970s. These changes onl y becam e possi bl e as m y m em ory im proved. First i t was stored in tubes,then on transistors and l ater on very sm al chi ps. As a resul tI total y changed m y shape . As I have grown ol der I have also grown sm al l er . Over tim e m y m em oryhas devel oped so m uch that , li ke an el ephant, I never frt anythi ng I have been tol d !And my memory became so large that even I couldn’t believe it!But I was always so lonely standing there by myself,until in the 1960s they gave m e a fami l y connected by a work . Iwas abl e to share m y knowl edge wi th others through the Worl d Wi de Web. Si nce the 1970s m any new appli cati ons have been found for m e . I have bee very i mportant i n m uni cati on, fi nance and trade I have al so been put i nto robots and used to m ake m obi le phones as wel l as hel p with m edical operati ons. I have even been put i nto space rockets and sent to expl ore the Moon and Mars . A nyhow, m y goal i s to provi de hum ans wi th a li fe of hi gh quali ty. I am now trul y fi l ed wi th happi ness that I am a devoted fri end and hel per of the human race ! AN DY—TH E AN DRO ID I’m part of an an android football team . About once a year we are allowed to get together to play a game of footbal. I’m as big as a human . In fact ,I look like one the fotbalteam I’m a striker so I have to be able to run very fast .My puter chips help me to mova and thi nk li ke a hum an . For exam pl e , I have l earned to si gnal to m y team m ates i n puter languages to give m e the bal when I am open and have a good shot for a goal . My fi rat footbal peti ti on was i n N agoya , Japan several years ago . Last year our team went to Seattl e , Washi ngton i n the won tsecong pl ace . Personal y , I thi nk the team that won fi rsy pl ace cheated . They had devel oped a new type of program just before the peti ti on. So we need to encourage our programer to i m prove our i ntel i gence are determi ned to create an even better system . In a way our programm et i s li ke our coach. She program s us wi th m oves to use i f a new