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

【答案】theories
【解析】句意:畢業(yè)后,錢學(xué)森成為研究火箭和導(dǎo)彈理論的研究者。theory理論。由and可知前后是并列關(guān)系,根據(jù)rockets可知此處用復(fù)數(shù),所以答案是theories。

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