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：60.00%
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Development of the Periodic Table
考友平均正确率：66.67%
Planets in Our Solar System
考友平均正确率：79.35%
17
Europe's Early Sea Trade with Asia
考友平均正确率：72.49%
Animal Signals in the Rain Forest
考友平均正确率：71.42%
Symbiotic Relationships
考友平均正确率：75.17%
18
Industrialization in the Netherlands and Scandinavia
考友平均正确率：74.23%
The mystery of yawning
考友平均正确率：69.31%
Lightning
考友平均正确率：72.35%
19
The Roman Army's Impact on Britain
考友平均正确率：63.27%
Succession, Climax, and Ecosystems
考友平均正确率：70.34%
Discovering the Ice Ages
考友平均正确率：65.56%
20
Westward Migration
考友平均正确率：66.62%
Early Settlements in the Southwest Asia
考友平均正确率：74.77%
Fossil Preservation
考友平均正确率：58.69%
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