单项选择题

Peter, David and Paul said following sentences:
Peter: David is a liar, Paul always tells the truth.
David: Peter is truthful.
Paul: David is a liar, Peter is truthful.
Two of these men always tell the truth, one of them sometimes tells the truth and sometimes lies. Which of these men is a liar

A. Peter
B. David
C. Paul
D. Not sure
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单项选择题
Each of the nine squares marked 1A to 3C in the grid should incorporate all the lines and symbols that are shown in the squares of the same letter and number immediately above and to the left. For example, 2B should incorporate all the lines and symbols that are in 2 and B. One of the squares is incorrect. Which one is it
A. 1A
B. 2C
C. 3B
D. 3C
单项选择题
The combined ages of Frasier and Niles is 88 years. The combined ages of Niles and Daphne is 76 years. The combined ages of Frasier and Daphne is 80 years. Figure out each person’s age.
A. Frasier 34, Niles 42, Daphne 46.
B. Frasier 43, Niles 42, Daphne 46.
C. Frasier 42, Niles 46, Daphne 43.
D. Frasier 46, Niles 42, Daphne 34.
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