Did you notice the ________ on the leader's face when he heard 23 countries couldn't get enough rice in Africa?A.appearanceB.descriptionC.expressionD.attitude
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C解析解析：考查名词辨析。此处指人的面部表情，而非长相，所以排除A，而B为“描述、描写”之意，attitude不能与后文的face搭配。C选项expression表情，脸色；如：a sad expression悲哀的表情。