4.23.We had a trip tothe Science Museumlast Saturday.
24.All the students inGrade 9joined in the trip.
25.First of all,our teachers told us a lot aboutsafety.
26.It took usabout two hoursto get there.
27.In the museum we talked withsome robots.
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解答 23.the Science Museum 24.Grade 9 25.safety 26.about two hours 27.some robots
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