NASA has made a ________ that our earth has no threat associated with the film 2012 which is based on pure myths.
A.clarification
B.classification
C.identification
D.presentation
网友回答
A解析考查名词辨析。clarification澄清，classification分类，identification辨别身份，presentation呈现，根据语境是NASA已经澄清了我们的地球没有威胁，所以选A。