Liu Xiang achieved his to bee the first man to cover the 110-meter hurdles in less than 12.91 seconds.
A. ambition
B. graduation
C. assistance
D. encouragement
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(答案→)A. ambition
B. graduation
C. assistance
D. encouragement
解析：词义辨析。 A. 野心；志向 B.毕业 C.援助 D.鼓励。句意：刘翔实现了他的志向……选A。