(theory) ______ methods are sometimes useless outside of the laboratory.

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问题 (theory) ______ methods are sometimes useless outside of the laboratory.

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答案Theoretical

解析 根据句子结构,methods前需要一个形容词作定语,theory的形容词为theoretical,意为“理论的”。-cal为形容词性后缀,类似的用法还有:medicine—medical(医学上的);economy—economical(节俭的)等。
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