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高中英语人教版2000年高一上10

Source: 恒星英语学习网    2015-03-18  我要投稿   论坛   Favorite  

[05:49.60]INTEGRATING SKILLS
[05:55.84]Reading and writing
[05:59.18]Without air,water and sunlight there would be no living things.
[06:06.92]Because they are so important,
[06:11.17]ecosystems try to be very careful with these valuable resources.
[06:17.73]Human beings often throw away things the