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探索美国国家地理《Ladders》系列分级读物，涵盖初级到高阶的丰富内容，包括自然科学、社会科学及核心阅读材料。本系列通过不同难度级别的书籍，帮助读者逐步提升英语阅读能力，同时拓宽知识视野。无论是初学者还是高级读者，都能找到适合自己的读物，享受阅读的乐趣并有效提升语言技能。
以下云资源目录树快照生成于[11个月前]，该学习资料由夸克云用户[心旷*怡的青蛙]分享（只展示大部分文件和目录）
美国国家地理《Ladders》分级读物：多级别英语阅读进阶指南10.18 GB(pdf文档259个；)
09.高阶社会科学【33本】
Yosemite National Park-3.pdf47.28MBYosemite National Park-2.pdf47.23MBYosemite National Park-1.pdf50.73MBYellowstone National Park-3.pdf44.45MBYellowstone National Park-2.pdf44.89MBYellowstone National Park-1.pdf48.67MBThe Pueblo-3.pdf42.03MBThe Pueblo-2.pdf41.48MBThe Pueblo-1.pdf45.07MBThe Maya-3.pdf46.58MBThe Maya-2.pdf46.33MBThe Maya-1.pdf50.29MBThe Inca-3.pdf46.42MBThe Inca-2.pdf47.17MBThe Inca-1.pdf51.01MBThe Declaration of Independence-3.pdf38.39MBThe Declaration of Independence-2.pdf37.65MBThe Declaration of Independence-1.pdf40.75MBThe Azte-3.pdf49.51MBThe Azte-2.pdf50.39MBThe Azte-1.pdf54.97MBGreat Smoky Mountains National Park-3.pdf46.12MBGreat Smoky Mountains National Park-2.pdf45.96MBGreat Smoky Mountains National Park-1.pdf48.37MBGrand Canyon National Park-3.pdf45.87MBGrand Canyon National Park-2.pdf44.09MBGrand Canyon National Park-1.pdf46.35MBEverglades National Park-3.pdf48.83MBEverglades National Park-2.pdf48.72MBEverglades National Park-1.pdf52.38MBBig Bend National Park-3.pdf39.36MBBig Bend National Park-2.pdf38.81MBBig Bend National Park-1.pdf45.07MB08.高阶自然科学【30本】
The World's Ocean-3.pdf40.7MBThe World's Ocean-2.pdf40.25MBThe World's Ocean-1.pdf43.27MBThe Sinking of the Titanic-3.pdf41.17MBThe Sinking of the Titanic-2.pdf41.78MBThe Sinking of the Titanic-1.pdf45.17MBThe Galdpagos Ilslands-3.pdf34.87MBThe Galdpagos Ilslands-2.pdf36.18MBThe Galdpagos Ilslands-1.pdf37.48MBThe Disappearing Badlands-3.pdf45.02MBThe Disappearing Badlands-2.pdf43.13MBThe Disappearing Badlands-1.pdf48.37MBPower Up-3.pdf41.33MBPower Up-2.pdf43.47MBPower Up-1.pdf45.38MBNature Has the Answers-3.pdf36.81MBNature Has the Answers-2.pdf36.46MBNature Has the Answers-1.pdf40.5MBGoing Green-3.pdf46.97MBGoing Green-2.pdf46.29MBGoing Green-1.pdf51.1MBExploring Above and Beyond-3.pdf42.72MBExploring Above and Beyond-2.pdf44.2MBExploring Above and Beyond-1.pdf46.63MBEarth's Crazy Climate-3.pdf39.31MBEarth's Crazy Climate-2.pdf41.13MBEarth's Crazy Climate-1.pdf41.56MBAfrican Savanna-3.pdf43.14MBAfrican Savanna-2.pdf43.04MBAfrican Savanna-1.pdf46.12MB07.高阶核心阅读【24本】
Watery World-980L.pdf45.9MBWatery World-900L.pdf45.38MBWatery World-800L.pdf45.68MBWatery World-730L.pdf48.37MBTransformers-990L.pdf28.48MBTransformers-890L.pdf27.96MBTransformers-790L.pdf27.2MBTransformers-700L.pdf30.95MBThe Old West-980L.pdf30.1MBThe Old West-890L.pdf31.16MBThe Old West-780L.pdf30.38MBThe Old West-630L.pdf32.87MBMoving Into the Future-920L.pdf36.14MBMoving Into the Future-830L.pdf34.93MBMoving Into the Future-780L.pdf38.89MBMoving Into the Future-1000L.pdf35.78MBConnections to Nature-940L.pdf41.65MBConnections to Nature-860L.pdf42.01MBConnections to Nature-750L.pdf45.16MBConnections to Nature-1010L.pdf41.03MBCatch the Light-990L.pdf37.03MBCatch the Light-920L.pdf37.51MBCatch the Light-790L.pdf35.8MBCatch the Light-670L.pdf39.33MB06.中级社会科学【39本】
Pacific Coast-3.pdf45.62MBPacific Coast-2.pdf45.55MBPacific Coast-1.pdf49.63MBNorth Atlantic Coast-3.pdf49.55MBNorth Atlantic Coast-2.pdf50.11MBNorth Atlantic Coast-1.pdf54.08MBNiagara Fals-3.pdf48.79MBNiagara Fals-2.pdf48.6MBNiagara Fals-1.pdf52.58MBNative Americans of the Southwest-3.pdf52.95MBNative Americans of the Southwest-2.pdf48.36MBNative Americans of the Southwest-1.pdf53.9MBNative Americans of the Southeast-3.pdf46.12MBNative Americans of the Southeast-2.pdf46.09MBNative Americans of the Southeast-1.pdf50.36MBNative Americans of the Pacific Northwest-3.pdf45.12MBNative Americans of the Pacific Northwest-2.pdf44.84MBNative Americans of the Pacific Northwest-1.pdf48.11MBNative Americans of the Great Plains-3.pdf45.36MBNative Americans of the Great Plains-2.pdf44.47MBNative Americans of the Great Plains-1.pdf49.04MBMount Rushmore-3.pdf47.19MBMount Rushmore-2.pdf47.22MBMount Rushmore-1.pdf51.69MBGulf Coast-3.pdf47.06MBGulf Coast-2.pdf46.56MBGulf Coast-1.pdf50.46MBGreat Plains-3.pdf45.24MBGreat Plains-2.pdf44.74MBGreat Plains-1.pdf48.86MBGreat Lakes-3.pdf46.84MBGreat Lakes-2.pdf46.91MBGreat Lakes-1.pdf50.92MBGolden Gate Bridge-3.pdf42.83MBGolden Gate Bridge-2.pdf43.2MBGolden Gate Bridge-1.pdf47.49MBEmpire State Building-3.pdf48.7MBEmpire State Building-2.pdf45.98MBEmpire State Building-1.pdf48.97MB05.中级自然科学【30本】
30.pdf38.07MB29.pdf38.41MB28 Smart Animals!.pdf41.21MB27.pdf45.95MB26.pdf47.86MB25 At the Movies!.pdf48.86MB24.pdf41.8MB23.pdf45.7MB22 Exploring Coral Reefs!.pdf47.81MB21.pdf40.74MB20.pdf40.7MB19 Tim Samaras.pdf44.67MB18.pdf45.96MB17.pdf46.06MB16 Super Structures!.pdf49.77MB15.pdf40.87MB14.pdf41.37MB13 Let's Keep Moving!.pdf46.29MB12.pdf40.91MB11.pdf44.19MB10 Weird but True!.pdf44.84MB09.pdf45.45MB08.pdf45.84MB07 Pattems!.pdf48.73MB06.pdf36.19MB05.pdf35.99MB04 Let's Cook!.pdf39.11MB03.pdf42.58MB02.pdf45.53MB01 The Chesapeake Bay!.pdf50.26MB04.中级核心阅读【20本】
20.pdf42.4MB19.pdf41.87MB18.pdf41.55MB17 Worth Saving!.pdf44.61MB16.pdf34.59MB15.pdf33.82MB14.pdf33.77MB13 Nature's Genius!.pdf37.88MB12.pdf30MB11.pdf29.53MB10.pdf29.32MB09 Lend Me a Paw!.pdf33.3MB08.pdf35.27MB07.pdf37.09MB06.pdf36.18MB05 Moon Mysteries!.pdf40.34MB04.pdf45.7MB03.pdf45.02MB02.pdf45.57MB01 The Quest!.pdf48.57MB03.初级社会科学【21本】
Living on the Plains-840L.pdf31.5MBLiving on the Plains-680L.pdf31.57MBLiving on the Plains-550L.pdf35.5MBLiving on the Coast-830L.pdf31.2MBLiving on the Coast-700L.pdf30.43MBLiving on the Coast-600L.pdf34.57MBLiving in the Desert-830L.pdf30.64MBLiving in the Desert-710L.pdf30.65MBLiving in the Desert-570L.pdf32.87MBLiving by the Water-840L.pdf30.72MBLiving by the Water-710L.pdf30.26MBLiving by the Water-600L.pdf33.04MBKenya-820L.pdf31.38MBKenya-720L.pdf31.41MBKenya-600L.pdf34.05MBIndia-790L.pdf31.33MBIndia-640L.pdf30.97MBIndia-540L.pdf33.97MBBrazil-810L.pdf32.52MBBrazil-690L.pdf31.3MBBrazil-590L.pdf35.91MB02.初级自然科学【30本】
Tropical Rain Forest Adventure-810L.pdf34.31MBTropical Rain Forest Adventure-720L.pdf33.12MBTropical Rain Forest Adventure-620L.pdf37.53MBTricks,Traps,and Tools-810L.pdf27.31MBTricks,Traps,and Tools-680L.pdf27.62MBTricks,Traps,and Tools-550L.pdf31.94MBOn Assignment with Joel Sartore-820L.pdf33.66MBOn Assignment with Joel Sartore-710L.pdf34.98MBOn Assignment with Joel Sartore-600L.pdf39.15MBLadders-Earth Science-Roller Coasters-860L.pdf32.03MBLadders-Earth Science-Roller Coasters-710L.pdf32.75MBLadders-Earth Science-Roller Coasters-570L.pdf35.47MBLadders-Earth Science-Eruption-810L.pdf36.49MBLadders-Earth Science-Eruption-700L.pdf35.27MBLadders-Earth Science-Eruption-590L.pdf39.94MBLadders-Earth Science-Destination Space-860L.pdf31.05MBLadders-Earth Science-Destination Space-710L.pdf30.83MBLadders-Earth Science-Destination Space-610L.pdf34.63MBLadders-Earth Science-Cool Caves-840L.pdf33.89MBLadders-Earth Science-Cool Caves-740L.pdf33.55MBLadders-Earth Science-Cool Caves-590L.pdf37.07MBLadders-Earth Science-Big Storm-810L.pdf32.56MBLadders-Earth Science-Big Storm-720L.pdf34.37MBLadders-Earth Science-Big Storm-580L.pdf38.39MBKeep Outl Keep Away-780L.pdf31.01MBKeep Outl Keep Away-690L.pdf29.45MBKeep Outl Keep Away-580L.pdf33.75MBHidden Discoveries-790L.pdf31.38MBHidden Discoveries-650L.pdf32.55MBHidden Discoveries-530L.pdf35.62MB01.初级核心阅读【32本】
Onward-820L.pdf32.67MBOnward-670L.pdf32.36MBOnward-490L.pdf30.75MBOnward-400L.pdf34.93MBMixed-Up Matter-800L.pdf26.81MBMixed-Up Matter-640L.pdf26.59MBMixed-Up Matter-490L.pdf25.95MBMixed-Up Matter-380L.pdf29.89MBMake a Difference-840L.pdf31.28MBMake a Difference-690L.pdf30.92MBMake a Difference-550L.pdf30.89MBMake a Difference-430L.pdf33.95MBForces of Nature-810L.pdf40.55MBForces of Nature-720L.pdf39.32MBForces of Nature-580L.pdf37.07MBForces of Nature-450L.pdf40.26MBDinosaurs-840L.pdf40.13MBDinosaurs-680L.pdf41.25MBDinosaurs-530L.pdf39.13MBDinosaurs-410L.pdf43.11MBBirthday Celebrations-840L.pdf30.53MBBirthday Celebrations-720L.pdf30.76MBBirthday Celebrations-570L.pdf29.83MBBirthday Celebrations-450L.pdf34.89MBAmazing Plants-820L.pdf45.27MBAmazing Plants-710L.pdf45.69MBAmazing Plants-570L.pdf44.33MBAmazing Plants-450L.pdf48.69MBAll Together Now-840L.pdf26.35MBAll Together Now-710L.pdf26.54MBAll Together Now-540L.pdf25.19MBAll Together Now-420L.pdf30.29MB
