单词：primitive ependymal layer
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Unit 2 net changes life Part one warming up A 、key words: email message addresses ? Queen Elizabeth the Second ? e-mail accounts ? Vocabulary: crash coordinate account ? main You are going to hear some important days in e-mai history. Supply the mi
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I first heard about the ozone layer about twenty years ago. I was still in school. I thought it was interesting, but I didnt take it seriously. It was a bit like science fiction, I mean, how could there be a giant hole in the atmosphere? Over the yea
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This is the VOA Special English Health Report. 这里是美国之音慢速英语健康报道。 Israeli researchers say they have developed a substance that attracts and kills mosquitoes infected with the malaria parasite. However, the sweet smelling
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There is a special day to recognize the importance of the ozone layer. In 1995, the United Nations General Assembly decided September 16th is the International Day for the Preservation of the Ozone Layer. This is the date on which countries signed th
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Searching for Animal Disease Transmission Researchers are not waiting for the next new disease to emerge. Theyre studying our near and distant primate relatives to try to prevent future epidemics. HIV/AIDS is a well-known zoonotic disease, an illness
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I first heard about the ozone layer about twenty years ago. I was still in school. I thought it was interesting, but I didnt take it seriously. It was a bit like science fiction, I mean, how could there be a giant hole in the atmosphere? Over the yea
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