Obama’s success in presidential election proves that the color of one’s skin shouldn’t be a to success.
A. barrier
B. behavior
C. battle
D. bunch
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(答案→)A. barrier
B. behavior
C. battle
D. bunch
解析：
考查名词词义辨析。句意为：奥巴马总统竞选成功证明肤色不应该成为成功的障碍。此处barrier意为“障碍”。