美国英语听力80篇1 Lesson15

[00:05.12]Cassava is an important food in the diets of more than 500,000,000 people in Africa, Asia and South America. [00:15.70]However, the United Nations Food and Agriculture Organization notes that agricultural development policies [00:24.53]ofte

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Silkworm s and Skin Graft s Don: One of the neater things thats going on in biology is the genetic modification of species. By changing the instructions in their genes, we can make certain plants and animals produce things that are useful to humans.

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The Syrian rebel forces have pushed militants of IS group out of a strategic town in northern Syria after days of heavy fighting. Lina Sinjab is in neighboring Lebanon. Moderate rebel fighters from the Free Syrian Army have succeeded pushing IS milit