Is the messenger a truth teller or not? How can the visitor be sure??
1. According to the messengers answer, the visitor can conclude that_______________?
A. The messenger lives on the western side of the island because he tells the truth.?
B. the messenger lives on the eastern side of the island because his answer may be a lie.
C. its hard to determine whether the messenger is a truth teller or not.
D. the messenger probably lives in the western side of the island because his answer may be true.
2. The native in the distance says he lives on the western side of the island. According to his answer, which conclusion of the following is wrong??
A. He may live on the eastern side of the island. ?
B. He may live on the western side of the island.?
C. He may be telling the truth.? D. He cant be telling the truth.
解析: 第1题是推测有关信使(近处的当地人)的情况的。我们知道,讲真话的部落住在岛的西部,撒谎的部落住在岛的东部。这个信使去问远方的当地人住在岛的哪一边(东部还是西部)。远方的当地人只能有两种情况,要么住在岛的西部,要么住在岛的东部。假如他住在岛的西部,他就是一个讲真话的人,他就会如实回答他住在西部。假如他住在岛的东部,他就是一个撒谎的人。他本来住在东部,但在回答时,必须要说谎,他只能回答他住在西部。所以远方的当地人不管是住在东部还是西部,他的回答只有一个:我住在西部。假如信使告诉参观者远方的当地人住在西部,信使无疑是说了真话,那么信使一定是住在岛的西部。反之,假如信使告诉参观者远方的当地人住在东部,那么信使就说了假话,信使肯定住在东部。故此题答案是A。?
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