Heroes their life being the best they can be, whether it is President of the United States, a mother, or a firefighter.
A. prevent…from
B. devote…to
C. prefer…to
D. suffer…from
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A. prevent…from
(答案→)B. devote…to
C. prefer…to
D. suffer…from
解析：四个选项分别表示阻止……，将……投入、 更喜欢……、受……的苦，根据题意选B，英雄们将他们的一生投入到成为最强者的事业中去，