【題目】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】

考查形容詞詞義辨析。句意：為了使實驗有效，必須準確地記錄數(shù)據(jù)。A.essential基本的；B.confidential機密的；C.potential潛在的；D.definite明確的。根據(jù)句意，此處用固定詞組：be essential to“對……必不可少的”。此處是it作形式主語，動詞不定式做真正的主語。故選A。

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