Problem description:
1. On a street, there are five houses painted in five colors. People of different nationalities live in each room. Everyone drinks different drinks, smokes different brands of cigarettes and keeps different pets. The question is: Who raises fish? Hint: 1, English people live in red houses 2, Swedes keep dogs 3, Danes drink tea 4, green houses are on the left side of white houses 5, owners of green houses drink coffee 6, people who smoke PallMall cigarettes keep birds 7, owners of yellow houses smoke Dunhill cigarettes 8, people who live in middle houses drink milk 9, and Norwegians live in the first room 10. Blends smokers live next door to cat owners 1 1, horse owners live next door to Dunhill smokers 12, BlueMaster smokers drink beer 13, Germans smoke prince cigarettes 14, Norwegians live next door to blue houses 15, and one person smokes blee.
Analysis:
A bank safe was broken into and a large amount of cash and securities were stolen. After investigation, the police arrested three main suspects: Singh, Repton and Angel. Through the trial, the following facts were ascertained:
(1) The safe was pried open with a special crime tool, and the use of this tool must be specially trained.
(2) If Singer commits a crime, then Angel also commits a crime.
(3) Ripton has no special training in using criminal tools.
(4) The criminal is one or a group of these three people.
Which of the following conclusions is correct?
A. Schsinger is a criminal, and the situation of Repton and Angel is unknown.
B. Schsinger and Ripton are criminals, and Angel's situation is unknown.
C. Angels are criminals, but the situation of Singh and Ripton is unknown.
D. Ripton is a criminal, but the situation of Schsinger and angel is unknown.
E. Schsinger, Repton and Angel are all criminals.
The answer is C.
[analysis]
It can be seen from conditions (1) and (3) that it is not clear whether Ripton participated in the crime. Combined with condition (4), we can know that whether Ripton participated in the crime or not, at least one of the other two people, namely Schsinger and An Jisi, participated in the crime; From the condition (2) "If Singer commits a crime, then Angel commits a crime", we can know that if Angel does not commit a crime, then Singer does not commit a crime, then no one will participate in the crime, which contradicts the condition (4), so Angel must commit a crime. As for whether Schsinger participated in the crime, it is impossible to make a clear judgment from the given conditions.
A jewelry store was stolen and five employees were arrested. Suppose that among the five employees, all the people involved in the crime are lies, and the innocent people are telling the truth. The five employees have the following statements respectively:
Zhang said: "Wang is the perpetrator." Wang talked about his situation.
Wang said: "Li is the perpetrator."
Li said, "This is Zhao Zuo's business."
Zhao said, "This is Sun Zuo's case."
Sun did not say a word.
According to the above statement, which of the following conclusions can be inferred?
A Zhang committed a crime, Wang did not commit a crime, Li committed a crime, Zhao did not commit a crime, and Sun committed a crime.
B Zhang did not commit a crime, Wang did, Li did not commit a crime, Zhao did, and Sun did not commit a crime.
C. All five employees were involved in the crime.
D. None of the five employees committed a crime.
There is not enough information in E.stem to determine whether each employee commits a crime.
The answer is a.
[analysis]
From the topic, Zhang said: "Wang is the perpetrator." Wang talked about his own situation. We assume that among the five employees, those who participated in the crime are all lies, and only innocent people tell the truth. Therefore, if Wang is the perpetrator, he can't admit his crime, otherwise, the perpetrator will tell the truth.
Therefore, Zhang is lying, so Zhang is an actor and Wang is not an actor;
Therefore, Wang is telling the truth, so Li is the perpetrator;
Therefore, what Li said is a lie, and Zhao is not the perpetrator;
So Zhao told the truth, so Sun was the perpetrator;
Therefore, option A holds.
I'm afraid Mr. Zhang's physical condition is not suitable for continuing to be the department manager. Because in the past year, as long as Mr. Zhang wrote to the general manager, there was only one content, either uncomfortable here or problematic there.
In order to make the above argument valid, which of the following must be assumed?
(1) Being competent as a department manager requires good physical conditions.
(2) The contents of Mr. Zhang's letter to the general manager are basically true.
In the past year, Mr. Zhang often wrote to the general manager.
A. only (1). Only b(2)
C. only (3). Only d( 1) and (2).
E.( 1), (2) and (3)
The answer is e.
[analysis]
The core argument of the problem includes two steps. First, according to the contents of Mr. Zhang's letter to the general manager, it is proved that Mr. Zhang is in poor health; Second, because of Mr. Zhang's poor physical condition, he should not continue to be the department manager.
(1) must be established, otherwise, the second argument cannot be established.
(2) It must be established, otherwise the first argument of the topic cannot be established.
(3) It must also be established. Otherwise, even if the content of Mr. Zhang's letter to the general manager is basically true, it can't be concluded that Mr. Zhang is in poor health, which makes the second argument of the topic untenable.
In 1930s, people discovered a kind of cotton with green and brown fibers. However, until recently, a variety of long fibers that can be woven has been cultivated, and they have no commercial value. Because this kind of cotton doesn't need dyeing, the processing enterprise saves the dyeing cost and avoids the environmental pollution caused by the dyeing process.
Which of the following conclusions can be inferred from the stem?
(1) Green or brown cotton that can only be spun by hand has no commercial value.
(2) Short fiber green or brown cotton can only be spun by hand.
(3) If dyeing is omitted in cotton processing, environmental pollution can be avoided.
A. only (1) and (2) B only (1) and (3)
Only c(2) and (3) only D( 1)
E.( 1), (2) and (3)
The answer is a.
[analysis]
The title "until recently, all kinds of long fibers can be woven into commercial value" expresses the necessary conditions and can be sorted into "only long fibers that can be woven into commercial value." According to this conditional relation, (1) holds, because if we deny the antecedent, we can deny the latter.
(2) It is also true. From the sentence "until recently, a long fiber variety has been cultivated", it can be seen that green or brown cotton with short fiber can only be spun by hand, not by machine.
(3) It is not necessarily true, because dyeing in cotton processing may only be a process or link that causes environmental pollution, and other process links may also cause environmental pollution in cotton processing.
By the way, are you going to take the civil service exam?