Questions 17-22.

　　In a small office suite, six offices are arranged in a

　　straight line, one after another, and are consecutively num-

　　bered 1 through 6. Exactly six people― P, Q, R, S, T and

　　U― are to be assigned to these six offices, exactly one

　　person to an office, according to the following

　　conditions:

　　P must be assigned to an office immediately adjacent

　　to the office to which T is assigned.

　　Q cannot be assigned to an office immediately adja-

　　cent to the office to which S is assigned.

　　R must be assigned either to office 1 or to office 6.

　　S must be assigned to a lower-numbered office than

　　the office to which U is assigned.

　　17.Which of the following can be the list of the six

　　people in the order of their offices, from office 1

　　through office 6?

　　(A) Q, U, S, T, P, R

　　(B) R, P, T, S, U, Q

　　(C) R, S, Q, U, P, T

　　(D) S, T, Q, P, U, R

　　(E) T, P, S, R, Q, U

　　18.If T is assigned to office 6. then U must be assigned

　　to office

　　(A) 1

　　(B) 2

　　(C) 3

　　(D) 4

　　(E) 5

　　19.If Q is assigned to office 2, then the person assigned

　　to office 6 must be

　　(A) P

　　(B) R

　　(C) S

　　(D) T

　　(E) U

　　20.If Q is assigned to office 1, which of the following

　　CANNOT be true?

　　(A) P is assigned to office 3.

　　(B) P is assigned to office 4.

　　(C) S is assigned to office 4.

　　(D) T is assigned to office 2.

　　(E) T is assigned to office 3.

　　21.If U is assigned to office 3, then Q must be assigned

　　to office

　　(A) 1 or 2

　　(B) 1 or 6

　　(C) 2 or 5

　　(D) 4 or 5

　　(E) 4 or 6

　　22.If S is assigned to office 2, which of the following

　　can be true?

　　(A) P is assigned to office 1.

　　(B) Q is assigned to office 3.

　　(C) R is assigned to office 6.

　　(D) T is assigned to office 5.

　　(E) U is assigned to office 4.

　　23.As government agencies, faced with budget difficul-

　　ties, reduce their funding for scientific research, a

　　greater amount of such research is being funded by

　　private foundations. This shift means that research

　　projects likely to produce controversial results will

　　almost certainly comprise a smaller proportion of all

　　funded research projects, since private foundations,

　　concerned about their public image, tend to avoid

　　controversy.

　　Which of the following is an assumption on which

　　the argument depends?

　　(A) Only research that is conducted without concern

　　for the possibility of generating controversy is

　　likely to produce scientifically valid results.

　　(B) Private foundations that fund scientific research

　　projects usually recognize that controversial

　　results from those projects cannot always be

　　avoided.

　　(C) Scientists who conduct research projects funded

　　by private foundations are unlikely to allow the

　　concerns of the funding organizations to influ-

　　ence the manner in which they conduct the

　　research.

　　(D) Many government agencies are more concerned

　　about their public image than are most private

　　foundations.

　　(E) Government agencies are more willing than are

　　private foundations to fund research projects

　　that are likely to produce controversial results.

　　24.Juries in criminal trials do not base verdicts on uncor-

　　roborated testimony given by any one witness. Rightly

　　so, because it is usually prudent to be highly skeptical

　　of unsubstantiated claims made by any one person.

　　But then, to be consistent, juries should end an all-

　　too-common practice: convicting defendants on the

　　basis of an uncorroborated full confession.

　　Which of the following, if true, most strengthens the

　　argument above?

　　(A) Juries often acquit in cases in which a defendant

　　retracts a full confession made before trial.

　　(B) The process of jury selection is designed to screen

　　out people who have a firm opinion about the

　　defendant's guilt in advance of the trial.

　　(C) Defendants sometimes make full confessions when

　　they did in fact do what they are accused of

　　doing and have come to believe that the prose-

　　cutor has compelling proof of this.

　　(D) Highly suggestible people who are accused of

　　wrongdoing sometimes become so unsure of

　　their own recollection of the past that they can

　　come to accept the accusations made againstthem.

　　(E) Many people believe that juries should not convict defendants who have not made a full confession.

　　25.Although spinach is rich in calcium, it also contains large amounts of oxalic acid, a substance that greatly impedes calcium absorption by the body. Therefore, other calcium-containing foods must be eaten either instead of or in addition to spinach if a person is to be sure of getting enough calcium.

　　Which of the following, if true, most seriously weakens the argu-ment above?

　　(A)Rice, which does not contain calcium, counteracts the effects of oxalic acid on calcium absorption.

　　(B) Dairy products, which contain even more calcium than spinach does, are often eaten by people who eat spinach on a regularbasis.

　　(C) Neither the calcium nor the oxalic acid in spinach is destroyed when spinach is cooked.

　　(D) Many leafy green vegetables other than spinach that are rich in calcium also contain high concentrations of oxalic acid.

　　(E) Oxalic acid has little effect on the body's ability to absorb nutrients other than calcium.