VOA慢速英语2012.08.27
[audio]http://sound.yywz123.com/tingbbs/voa/voa20120827.mp3[/audio]A team of scientists in the United States has created a new type of mouse that has an immune system similar to that of humans. 美国的科学家小组创造出一种具有与人类相似的免疫系统的老鼠。
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