单项选择题 In contrast to Goya's various representations of sincere tears, then, are a series of representations of insincerity and emotional（）.

单项选择题 Though sometimes（）, all too often technology is seen as a（）for the great economic, social, and political challenges facing the nation as it embarks on the path of modernization.

单项选择题 They were certain that this problem, like so many other（）problems, did not ever have to be（）, but could be resolved through oblique means.