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Viruses can reproduce on their own and destroy host cells while bacteria cannot.

【参考答案】

N
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Common cold and influenza viruses both attack the respiratory system.
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Your role: a tour guide Your audience: a group of foreign tourists Your introduction should include: ● some welcoming words ● the schedule for the day ● a description of the place the tourists will be visiting(e, g. a scenic spot or a historical site, etc. ) You should make the introduction interesting and the arrangements for the day clear to everybody. A Brief Introduction to a Tourist Attraction
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