填空题

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

【参考答案】

N

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H5N1 is a subtype of avian flu and was first found in Hong Kong in 1997.

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Your role: a tour guideYour audience: a group of foreign touristsYour 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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