单选题：Whatdoes"impactfactor"(Line2,Para.4)referto?

题目分类：英语四级
题目类型：单选题
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题目内容：

Whatdoes"impactfactor"(Line2,Para.4)referto? A．Anumberthatmeasurestheimportanceofonejournal.
B．Anumberthatmeasureshowwellonejournalsells.
C．Anumberthatmeasureshowmuchsciencehasbeendistorted.
D．Anumberthatmeasurestheinfluenceofsocietyononejournal.

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