题目：
"Even then he stood there, hidden wholly in that kindness which is night, while the uprising fumes filled the room. When the odor reached his nostrils, he quit his attitude and fumbled for the bed. ’What’s the use’ he said, weakly, as he stretched himself to rest. " The above is quoted from Theodore Dreiser’s Sister Carrie. Briefly tell the situation that leads to Hurstwood’s suicide and interpret his final words—"What’s the use".
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C解析：无理函数的定积分求解可分为分部求解和换元求解，用换元求解，得：。
