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    【题目】In order for the experiment to be valid, it is ______ to record the data accurately.

    A.essentialB.confidentialC.potentialD.definite

    【答案】A

    【解析】

    考查形容词词义辨析。句意：为了使实验有效，必须准确地记录数据。A.essential基本的；B.confidential机密的；C.potential潜在的；D.definite明确的。根据句意，此处用固定词组：be essential to“对……必不可少的”。此处是it作形式主语，动词不定式做真正的主语。故选A。

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