7.All psychiatrists are doctors. Only psychiatrists were invited to the conference. All who were invited to the conference stayed at the Hefford Hote. Therefore, only psychiatrists stayed at the Hefford Hotel.
Which one of the following statements, if added as a premise to the argument, would make the conclusion valid?
(A) Only those who were invited to the conference stayed at the Hefford Hotel.
(B) All who were invited to the conference were psychiatrists.
(C) All psychiatrists were invited to the conference.
(D) No one who was invited to the conference failed to stay at the Hefford Hotel.
(E) Only doctors stayed at the Hefford Hotel.
Questions 14-15
Until now, this painting was believed to be a self portrait of the artist, but it probably is not. True, the heavy gold chain worn by the gentleman in the picture is similar to one presented to the artist by the Queen of England after he had painted her portrait. But the sword hanging at the gentleman's hip suggests that he was a knight, a rank higher than any the artist ever attained.
14. The argument above depends on assuming that the self-portrait would
(A) include objects that are important to the artist
(B) not exaggerate the rank achieved by the artist
(C) be similar to portraits of others whom the artist had painted
(D) be verifiable only through the examination of objects in the painting
(E) not portray the artist engaged in the activity of painting
15. Which one of the following, if true, would most strengthen the author's argument?
(A) Historians cannot determine whether the artist was ever knighted.
(B) The artist painted only one self-portrait in his entire life.
(C) Several gentlemen of the artist's day wore heavy gold chains like the one in the painting.
(D) The gentleman in the painting resembles portraits of the artist painted by other artists.
(E) The artist was the only gentleman of his day who received a heavy gold chain from the Queen of England.
16. Colleges boast about the great sizes of their libraries. They quote figures in the hundreds of thousands of volumes, but how many books can a student read in four years-a thousand? What good, then, are all the rest?
Which one of the following statements most accurately expresses the author's main point?
(A) College librarians do not have anything about which they can boast.
(B) No student can read more than a thousand books in four years.
(C) It is silly to boast about a library's size, regardless of whether the library is large or small.
(D) Unused books are a waste of taxpayers' money.
(E) College libraries are unnecessarily large.
17. Eli:According to many scientists the widespread production and use of chlorofluorocarbons (CFCs)-e.g., to provide coolant for air conditioners-inevitably leads to their escape into the atmosphere where they destroy the vital ozone layer. In my opinion, the continued use of CFCs by humans is like a harmful habit, which, if unchecked, could have disastrous effects on the user, namely self-destruction. The obvious and necessary cure, therefore, is a complete ban on CFC production and use.
Mark: The cure you propose would kill, not save, the user. A ban on CFC production and use would cause the destruction of the air conditioning industry.
The source of Mark, and Eli's dispute is their lack of agreement on which one of the following terms?
(A) cure
(B) user
(C) ban
(D) production
(E) destruction
18. If there is a decrease in the number of homeless families, then either the number of available jobs has increased or else the cost of renting or purchasing housing has decreased. If the cost of renting or purchasing housing has decreased, then the supply of housing must be greater than the demand.
