In the network there are two-way roads connecting each of the following pairs of points: 1 with 2, 1 with 3, 1 with 5, 2 with 6, 3 with 7, 5 with 6, and 6 with 7. There are also one-way roads going from 2 to 4, from 3 to 2, and from 4 to 3. There are no other roads in the network, and the roads in the network do not intersect.
To make a trip involving pick-ups and deliveries, the volunteer always takes a route that for the whole trip passes through the fewest of the points 1 through 7, counting a point twice if the volunteer passes through it twice.
The volunteers home is at point 3. Donations can be picked up at a supermarket at point 1, a clothing store at point 5, and a bakery at point 4. Deliveries can be made as needed to a tutoring center at point 2, a distribution center at point 6, and a shelter at point 7. If the volunteer starts at the supermarket and next is to go to the shelter, the first intermediate point his route passes through must be
2
3
5
6
7
答案：(B)
If starting from home, the volunteer next is to make pickups for the shelter at the supermarket and the bakery (in either order), the first two intermediate points on his route, beginning with the first, must be
1 and 2
1 and 3
2 and 1
2 and 4
4 and 2
答案：(A)
If starting from the clothing store, the volunteer next is to pick up bread at either the supermarket or the bakery (whichever stop makes his route go through the fewest of the points) and then is to go to the shelter, the first two points he reaches after the clothing store, beginning with the first, must be
1 and 2
1 and 3
4 and 2
6 and 2
6 and 4
答案：(B)
If the volunteer is to make a trip starting at the shelter, next going to the bakery for a pickup, and then ending at the distribution center, the first two intermediate points on his route, beginning with the first, can be
3 and 1
3 and 4
4 and 2
6 and 2
6 and 5
答案：(D)
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 be built 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 T and 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.
Which of the following can be the complete selection of house styles on a block¡
Q, R, S
Q, S, X
R, T, Z
S, W, Z
T, X, Z
答案：(D)
读题：一个房地产开发商计划在一块空地上建造housing complex。共有7种不同风格的房屋Q、R、S、T、W、X、Z, The Complex包含几个街区，每个街区至少包含3种不同风格。
写条件：
1、 Z → W (表示有Z就必有W)
2、（S，X）→ （T，Z）相邻 (表示与具有（S，X）风格街区相邻的街区必须有T，Z)
3、（R，Z）→ ～(T/W) 相邻 (表示与具有R、Z风格街区相邻的街区不能有T or W)
4、 S≠Q (表示S，Q不能同时在一个街区)
条件总结：
*注意4个条件中
1，4是对某个街区而言风格的约束。
2，3是针对相邻街区而言。
Which of the following house styles must be on a block that is adjacent to one that has on it only styles S, T, W, X, and Z ¡
Q
R
S
W
X
答案：(D)
Which of the following can be the complete selection of house styles for a block that is adjacent to exactly one block, if that one block has on it styles
S, T, W, and X only¡
S, T, and X
T, X, and Z
R, S, X, and Z
S, T, W, and X
T, W, X, and Z
答案：(E)
When an osprey (a fish-eating hawk) returns 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 readily as on 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¡ Ospreys are seldom able to catch alewives, pollack, or smelt. Alewives, pollack, and smelt move in schools, but winter flounder do not. Winter flounder prefer shallower waters than do alewives, pollack, or smelt. Winter flounder and pollack exhibit protective coloration, but alewives and smelt do not. Ospreys that five in nesting areas are especially successful fishers.
答案：(B)
A recent study of an insurance companys underwriters indicated that those who worked in pleasant physical surroundings were 25 percent more productive than their peers in unpleasant physical surroundings. Objective criteria for evaluating job performance included caseload and complexity of cases. This shows that improving workers environments increases those workers productivity.
Which of the following, if true, most seriously weakens the conclusion above¡
On average, less-productive employees spend no fewer hours per day at their workstations than do their more-productive peers.
Unpleasant surroundings give employees less motivation to work hard than more pleasant surroundings do.
The more-productive employees are generally rewarded with pleasant office space.
More-productive employees do not work any more hours than their less-productive peers.
Peer pressure discourages employees in crowded, unpleasant surroundings from making phone calls to their own family members during work time.
答案：(C)
