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Answers to the questions in the popular science knowledge contest of Science and Technology Festival (Grade 5 and 6)
The answers to multiple-choice questions are: b, d, c, a, c, b, a, b, c, d, c, b, a, b, c, d, c, c, c, b, a, b, b, a, b, b, c.
The answers to the judgment questions are: ×, ×, √, ×, √, ×, √, ×, √, ×, ×, √.