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
16
Trade and the Ancient Middle East
考友平均正确率：60.10%
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Development of the Periodic Table
考友平均正确率：66.81%
Planets in Our Solar System
考友平均正确率：79.34%
17
Europe's Early Sea Trade with Asia
考友平均正确率：72.79%
Animal Signals in the Rain Forest
考友平均正确率：71.73%
Symbiotic Relationships
考友平均正确率：75.59%
18
Industrialization in the Netherlands and Scandinavia
考友平均正确率：74.48%
The mystery of yawning
考友平均正确率：69.24%
Lightning
考友平均正确率：72.89%
19
The Roman Army's Impact on Britain
考友平均正确率：63.25%
Succession, Climax, and Ecosystems
考友平均正确率：70.59%
Discovering the Ice Ages
考友平均正确率：65.89%
20
Westward Migration
考友平均正确率：66.69%
Early Settlements in the Southwest Asia
Fossil Preservation
考友平均正确率：58.53%
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