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发布时间：2006-06-23 11:59     点击：

(E) Exactly two of the rooms assigned to the students are doubles.

3. Which one of the following must be true?　　

(A) Lee is assigned to a single　

(B) Pat shares a double with another student　

(C) Robin shares a double with another student　

(D) Two of the second-year students share a double with each other　

(E) Neither of the third-year students is assigned to a single

4. If Robin is assigned to a triple, which one of the following must be true?　　

(A) Lee is assigned to a single　

(B) Two second-year students share a double with each other　

(C) None of the rooms assigned to the students is a single　

(D) Two of the rooms assigned to the students are singles.　

(E) Three of the rooms assigned to the students are singles

5. If Terry and Val assigned to different doubles from each other, other, then it must be true of the students\' rooms that exactly　

(A) one is a single　

(B) two are singles

(C) two are doubles

(D) one is a triple　

(E) two are triples

6. Which one of the following could be true?　　

(A) The two fourth-year students are assigned to singles.　

(B) The two fourth-year students share a double with each other.　

(C) Lee shares a room with a second-year student　

(D) Lee shares a room with a third-year student　

(E) Pat shares a triple with two other students

Questions 7-11　　

A worker will insert colored light bulbs into a billboard equipped with exactly three light sockets, which are labeled lights 1, 2, and 3. The worker has three green bulbs, three purple bulbs, and three yellow bulbs. Selection of bulbs for the sockets is governed by the following conditions:　　

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