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(一) 玛丽有三只匣子,依次为金匣子、银匣子和铅匣子,三只匣子上分别刻着三句话。金匣子上刻的是:肖像不在此匣子中。银匣子上刻的是:肖像在金匣子中。铅匣子上刻的是:肖像不在此匣子中。在这三只匣子中,只有一只匣子里放着一张玛丽的肖像。玛丽许诺:如果有一天哪个求婚者能通过这三句话猜出肖像放在哪只匣子中,就嫁给他。我们再假定: 这三句话中只有一句是真话。请问:求婚者应该选择哪一个匣子呢?
(A) Mary has three boxes, followed by a gold box, silver box and lead box, the three box were engraved with three sentences. The gold box engraved is: portrait is not in this box. The silver box engraved is: portrait in the box. The engraved on the lead box is that the portrait is not in the box. Of the three boxes, only Mary posed in one of the boxes. Mary promises: If one day a suitor can guess which box the portraits fit in these three sentences, marry him. Let us assume again: Only one of the three sentences is true. Excuse me, what box should the suitor choose?