A developer is planning to build a housing complex on an empty tract of land.Exactly seven different styles of houses ——Q，R，S，T，W，X，and Z——will bebuild in the complex.The complex will contain several blocks，and the developer plans to put houses of at least three different styles on each block.The developer will build the complex according to the following rules：
Any block that has style Z on it must also have style W on it.
Any block adjacent to one that has on it both style S and style X must have on it
style Tand style Z.
No block adjacent to one that has on it both style R and style Z can have on it
either style T or style W.
No block can have on it both style S and style Q.
20.Which of the following can be the complete selection of house style on a block？
（A）Q，R，S
（B）Q，S，X
（C）R，T，Z
（D）S，W，Z
（E）T，X，Z
21.Which of the following can be the complete selection of house style on a block？
（A）Q
（B）R
（C）S
（D）W
（E）X
22.Which of the following can be the complete selection of house style for a block that is adjacent to exactly one block，if that one block has on it style S，T， W，and X only？
（A）S，T，and X
（B）T，X，and Z
（C）R，S，X，and Z
（D）S，T，W，and X
（E）T，W，X，and Z
23.When an osprey（a fish-eating hawk） returna from fishing to its nesting area with a fish like an alewife， a pollack，or a smelt，other ospreys will retrace its flight path in hopes of good fishing.There is seldom such a response if the first bird brings back a winter flounder.Yet ospreys feed on winter flounder just as ready as od any other fish.
Which of the following，if true，contributes most to an explanation of the fishing behavior of ospreys as it is described above？
（A）Ospreys are seldom able to catch alewives，pollack，or smelt.
（B）Alewives，pollack，and smalt move in schools，but winter flounder do not.
（C）Winter flounder prefer shallower waters than do alewives，pollack，or smelt.
（D）Winter flounder prefer and pollack exhibit protective coloration，but
alewives and smelt do not.
（E）Ospreys that live in nesting area are especially successful fishers. 24.A recent study of an insurance company's underwriters indicate that those who worked in pleasant physical surroundings were 25 percent more productive thantheir peers in unpleasant physical surroundings.Objective criteria for evaluating job performance included caseload and complexity of cases.This shows that improving workers' enviroments increases those workers'productivity.
Which of the following，if true，most seriously weakens the conclusion above？
（A）On average，less-productive employees spend no fewer hours per day at
their workstations thando their more-productive peers.
（B）Unpleasant surroundings give employees less motivation to work hard than
more pleasant surroundings do.
（C）The more-productive employees are generally rewarded with pleasant office
space.
（D）More-productive employees do not work any more hours than their
less-productive peers.
（E）Peer pressure discourages employees in crowed，unpleasant surroundings
from making phone calls to their own family members during work time.
25.In a certain country，individual tend to change their political affiliation readily from one political party to another.In the past the Union party grew larger because of this tendency，but although most of those who change to a new party affiliation change to the Union party， the Union party has remained about the same size in recent years.
Which of the following，if true，best helps to explain the change in the growth pattern of the Union party mentioned above？
（A）The economy has been prospering recently，and many of those who change
party affiliation are upwardly mobile and properous.
（B）In recent yeas those who were previously nonaffiliated have tended to join
the Union party if they joined any party at all.
（C）The percentage of voting-age citizens who change political party affiliation each year has remained constant，and the number of voting-age citizens has remained the same.
（D）The percentage of voting-age citizens who are affiliated with any political party has increased over the last ten years.
（E）Many members of the Unipn party have abandoned all political party affiliation in recent years.
5.Which of the following must be true？
（A）The green ball is under a lower-%26gt;
Transfer interrupted！
d%26gt;（B）The orange ball is under a lower-numbered cup than the green ball.
（C）The purple ball is under a lower-numbered cup than the green ball.
（D）The purple ball is under a lower-numbered cup than the red ball.
（E）The red ball is under a lower-numbered cup than the yellow ball.
6.If the orange ball is under cup 2，balls of which of the following colors could be under cups immediately adjacent to each other？
（A）Green and magenta
（B）Green and purple
（C）Orange and yellow
（D）Purple andred
（E）Red and yellow 7.If the magenta ball is under cup 1，balls of which of the following colors must be under cups immediately adjacent to each other？
（A）Green and orange
（B）Green and yellow
（C）Purple and red
（D）Purple and yellow
（E）Red and yellow 8.The company should not be held responsible for failing to correct the control- panel problem that caused the accident.Although the problem had been mentioned earlier in a safety inspector's report，companies receive hundreds of reports of such problem，and Industry Standard No.42 requires action on those problem only when an accident is foreseeable.
If the second sentence in the paragraph above is factually correct，the answer to which of the following questions is most relevant in helping to determine whether or not the company violated Industry Standard No.42 when it failed to correct the control-panel problem？
（A）Was the accident serious？
（B）Was the control-panel problem of a type that is known to incident that an accident is likely？
（C）Since the accident，has the company done a special safety check on all control panels？
（D）Did the safety inspector mention more than one problem in the same report？
（E）How long was the control panel in use before the problem was discovered？
9.Riothamus，a fifth-century king of the Britons，was betrayed by an associate， fought bravely against the Goths but was defeated，and disappeared mysteriously .Ri%26gt;
Transfer interrupted！
Riothamus，match almost exactly those attributed to King Arthur.Therefore，Riothamus must be thehistorical model for the legendary King Arthur.
The argument above requires at least one additional premise.Which of the following could be such a required premise？
（A）Modern historians have documented the activities of Riothamus better than those of any other fifth-century king.
（B）The stories told about King Arthur are not strictly fictitious but are based on a historical person and historical events.
（C）Riothamus' associates were the authors of the original legends about King Arthur.
（D）Legents about the fifth century usually embellish and romanticize the actual conditions of the livesof fifth- century nobility.
（E）Posterity usually remembers legends better than it remembers the actual historical events on which they are based.
