IELTS
筛选材料：
Passage 1 易
Why we need to protect polar bears 动物
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Passage 2 中
The Step Pyramid of Djoser 社会
Passage 3 难
The future of work 社会
The White Horse of Uffington 发展史
I contain multitudes 动物
How to make wise decisions 社会
Roman shipbuilding and navigation 发展史
Climate change reveals ancient artefacts in Norway’s glaciers 发展史
Plant 'thermometer' triggers springtime growth by measuring night-time heat 动物
Roman tunnels 发展史
Changes in reading habits 社会
Attitudes towards Artificial Intelligence 社会
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