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

(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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