IELTS
筛选材料：
Passage 1 易
THE IMPORTANCE OF CHILDREN'S PLAY 语言
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Passage 2 中
The growth of bike-sharing schemes around the world 社会
Passage 3 难
Motivational factors and the hospitality industry 商业
Alexander Henderson (1831-1913) 社会
Back to the future of skyscraper design 科技
Why companies should welcome disorder 商业
The concept of intelligence 语言
Saving bugs to find new drugs 健康
The power of play 语言
The secret of staying young 动物
Why zoos are good 环境
环境
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备考资料