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【题目】After he graduated, Qian Xuesen became a researcher who studied rockets and missile (theory/ theories).

【答案】theories
【解析】句意:毕业后,钱学森成为研究火箭和导弹理论的研究者。theory理论。由and可知前后是并列关系,根据rockets可知此处用复数,所以答案是theories。

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