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In order for the experiment to be valid,...

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

A.essential B.confidential C.potential D.definite

 

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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