10. All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.

If the statements in the passage are true, then which one of the following must also be true?
(A) Smoking often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John's friends know the same lifelong heavy smoker.
(D) Most of John's friends are not telling the truth.
(E) Some of John's friends are not telling the truth.

答案：E

纯粹的逻辑题：
JOHN并不知道有这样的朋友：大烟枪---一天40根，40年。
同时JOHN知道至少在他朋友中，他不是唯一这样子的(not unique)。
说明他的朋友也有人不认识这样的烟鬼。
而开头又说ALL OF his friends says that 他们认识这样的烟鬼。
那肯定是E：至少有朋友撒谎了。