【题目】It hasn’t been ______ that food from cloned animals is really safe for humans to eat.
A. confirmed B. considered
C. turned out D. proved
在线课程【答案】A
【解析】
试题分析：考查动词及短语词义辨析。动词confirm确认；consider考虑，认为；turn out结果是；prove证明；句意：由克隆动物生成而来的食物能否安全食用还没有被确认。根据句意可知A正确。