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Option 2: "wood"
Explanation: The text indicates that the frame drum is usually made of a simple frame, which is typically made of 'thin' material. Given the context of drums, 'wood' is a logical and common material for constructing frames, making this option the correct choice.
Option 1: "iron"
Explanation: The text discusses drums and their materials, but 'iron' is not mentioned or implied as a material used for frame drums. Instead, the text specifies that the frame is usually made of 'thin' material, which does not align with iron.
Option 3: "plastic"
Explanation: While plastic could be a material for drums, the text does not mention it in relation to frame drums. The focus is on traditional materials, and 'plastic' does not fit the context of the description provided.
Option 4: "glasses"
Explanation: The term 'glasses' is irrelevant in the context of drum construction. The text does not discuss any materials related to glasses, making this option incorrect.
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