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    Evidence obtained from observation and experiment is often used to ________ a scientific theory.

    A．confirm? B．claim

    C．conclude? D．calculate

     

    【答案】

    【解析】A

    解析　考查动词辨析。confirm证实；claim声称，断言；conclude得出结论；calculate计算，估计。句意为：由观察和实验得出的证据通常被用来证实科学理论。故A项正确。

     

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