根据课本P18 的课文内容，回答下列问题。 1. How many groups
题型：问答题
问题：
根据课本P18 的课文内容，回答下列问题。
1. How many groups did they give talks?
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2. What project did they talk about?
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3. What was the weather like that day?
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4. When did they give the talk?
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5. Who showed some physics?
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