What does the word "revelation" refer to here? (para.4)
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What happened to Hessy's father in Berlin?
What was the photographer's real purpose in sending Hessy's photo to the contest? (para.16)
What could have happened to Hessy if the Nazis had discovered who she was?
如果表中某列的基数比较低，则应该在该列上创建位图索引。
A. 对
B. 错
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