President Obama called Mandela “personal hero” while he was on visit to South Africa in July, 2013.
A. a; a
B. the; the
C. the; a
D. a; the
网友回答
(答案→)A. a; a
B. the; the
C. the; a
D. a; the
解析：考查冠词用法。不定冠词a/an修饰可数名词单数，表泛指，意为“一个，某个”；定冠词the表特指，意为“这个，那个”。on a visit to sp访问某地，据此排除B、D；call sb sth把某人称作......，这里是泛指“一个个人偶像”，应该用不定冠词a，排除C，故选A。