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重阳节
重阳节，又称登高节，为农历九月初九。在重阳节这天，传统的饮食是重阳糕、菊花（chrysanthemum）酒、菊花茶。登高、插茱萸（cornel）和赏菊是重阳节的重要习俗。这些活动不仅增加了重阳节的节日气氛，而且据说通过这些活动，还可以避祸免灾。如今，重阳节已经无法见到插茱萸的风俗了，但是很多人仍然习惯在这一天登高赏菊，观赏秋天的美景。在中国的一些地方，重阳节还有祭拜祖先之墓的风俗。具有悠久历史的重阳节已经被列入第一批国家级非物质（in切rngible）文化遗产名录。
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position, or slime. It was originally applied to the noxious
stench emanating from swamps that was thought to cause a
variety of disease in the centuries before microbes were S1.______
discovered and specifically linked to illness. But it was S2.______
until almost the end of the nineteenth century that a true
virus was proven to be the reason of a disease. S3.______
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studied. Not only are viruses too small to be seen with a
light microscope, they also cannot be detected through their S4.______
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other organisms. In fact, viruses show no traces of biological
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agents in the strictest way. Viruses are very simple pieces S5.______
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carbohydrates and lipid.) They are parasites require S8.______
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by attaching to a cell and inject its nucleic acid; once S9.______
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