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| Greenhouse Effect Problem | |
| 作者姓名： | 刘洪毓 |
| 作者单位： | 上海市亭林中学 |
| 摘 要： | Before there were humans, the world changed only slowly. The climate warmed and cooled, new plants and animals developed and became extinct(绝灭的) in their turn, and sea level rose and fell over periods of thousands, if not millions of years. But during the last two thousand years great changes have taken place. |
| 关 键 词： | 高中 英语 专项练习 参考答案 阅读理解题 |
Greenhouse Effect Problem |
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