阶段分类
1-5 入门基础，6-35 巩固练习，36 之后的用于测试和模考
学科分类
集中弥补容易丢分的话题和学科短板
1
Groundwater
考友平均正确率：57.95%
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The Origins of Theate
考友平均正确率：58.06%
Timberline Vegetation on Mountains
考友平均正确率：68.09%
2
Desert Formation
考友平均正确率：77.33%
The Origins of Cetaceans
考友平均正确率：65.69%
Early Cinema
考友平均正确率：68.88%
3
Architecture
考友平均正确率：72.38%
Depletion of the Ogallala Aquifer
考友平均正确率：74.25%
The Long-Term Stability of Ecosystems
考友平均正确率：74.98%
4
Deer Populations of the Puget Sound
考友平均正确率：69.00%
Cave Art in Europe
考友平均正确率：68.52%
Petroleum Resources
考友平均正确率：68.71%
5
Minerals and Plants
考友平均正确率：72.53%
The Origin of the Pacific Island People
考友平均正确率：70.31%
The Cambrian Explosion
考友平均正确率：79.92%
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