填空题

（）(重大事故接连出现，给人民生命财产造成严重损失) have taught us a sobering lesson.

【参考答案】

Frequent serious accidents that inflict/result in heavy loss......

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填空题

4（）

单项选择题

Cutting carbon dioxide emission by 60% will （）.

A. be reached when low-income countries agree to reach an agreement
B. cause a collapse of the world economy
C. reduce in a large amount the content of CO₂in the atmosphere
D. help realize a stabled world economy