问题补充：
Successful people have some good qualities and above all, they are never a simple life so they keep fighting until they are top ones．
A. interested in
B. curious about
C. content with
D. confident in
答案：
A. interested in
B. curious about
(答案→)C. content with
D. confident in
解析：考查固定短语。句意“成功人士有一些好的品质，最重要的是，他们从不满足简单的生活，所以他们一直奋斗，直到他们成为优秀的人。”A“对......感兴趣”；B“对......感到好奇”；C“对......感到满足”；D“对......有信心”。故选C。
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