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答案：B
解析：
Choice (B) is correct. The structure of the sentence indicates that the word that fills in the blank will be explained by the part of the sentence that follows the colon. We are told that Gordon Parks adapted the screenplay for The Learning Tree "from his own novel," wrote music for the film, and directed the film. Because of his involvement in several different aspects of the film, it makes sense to describe Parks as "protean," or demonstrating great variety and diversity.
