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【单选题】
His research focused on the complex anatomy of birds in flight, and he based his flying machines on this analogy. (Para. 6)A.
When he designed his flying machines, he imitated birds in flight.
B.
He carefully studied the shape and structure of birds and applied the principles of their flight to the design of his flying machines.
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【简答题】提出“结构主义”学说并倡导“发现学习”方法的教育家是（ ）。
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