If the only house with granite siding is house 2 and
if house 6 has tile siding, which of the following houses
can have wood siding?
House 3
House 5
House 7
House 9
House 9
————————————————————————
答案：(E)
读题：一个设计师设计一排9个房屋从1到9，每个屋子用5种不同类型屋顶之一
g、p、s、t、w
写条件：
1、≥1 （表示每种屋顶至少被使用一次）
2、w→（ws）/（sws） （表示有W，则W和至少一个S相邻）
3、～（w/s t） （表示W,S不和t相邻）
4、g→(g t/p)/(tgp) （表示有g,则g和t,p至少一个相邻）
5、s≠4,9 （表示4,9不能为S）
条件总结：
由条件1知，每种屋顶至少被使用一次，
所以对条件2，条件4来说，必然存在w,g，充分条件可转化为一种固定的必然条件，
对W：一定有(ws)/（sws）
对g：一定有(g t/p)/(tgp)
如果g=2（注意这是仅有的g）并且t=6,下面哪一个可能是w？
2 3 4 5 6 7 8 9
g t
1、首先我们看一下g、t的条件，
由条件3：～(w/s t)得，w≠5,7
2、问哪一个可能是w，而涉及w的条件还有(ws)/(sws)，因此放w的地方必须有至少两个
连续空间
3、现在留下的连续空间只有34/89, 故(ws)=34/89,
由于s≠4,9，故w可以为4or9，所以选E
If the only house with wood siding is house 3, then
any of the following houses can have tile siding EXCEFT
house
1
5
6
8
9
————————————————————————
答案：(A)
读题：一个设计师设计一排9个房屋从1到9，每个屋子用5种不同类型屋顶之一
g、p、s、t、w
写条件：
1、≥1 （表示每种屋顶至少被使用一次）
2、w→（ws）/（sws） （表示有W，则W和至少一个S相邻）
3、～（w/s t） （表示W,S不和t相邻）
4、g→(g t/p)/(tgp) （表示有g,则g和t,p至少一个相邻）
5、s≠4,9 （表示4,9不能为S）
条件总结：
由条件1知，每种屋顶至少被使用一次，
所以对条件2，条件4来说，必然存在w,g，充分条件可转化为一种固定的必然条件，
对W：一定有(ws)/（sws）
对g：一定有(g t/p)/(tgp)
如果仅有的有w屋顶的是3，那么下面哪一个可能有t，EXCEPT?
解题步骤:
1、找涉及w的条件,由条件2 (ws)/(sws)得，s=2,4中至少一个
在有s≠4,9得， s=2
2、在由 ～(w/s t)得，t≠1
If houses 4 and 5 have wood siding and if houses 1
and 8 have plaster siding, then the siding on house must
be
granite
plaster
shingle
tile
wood
————————————————————————
答案：(D)
读题：一个设计师设计一排9个房屋从1到9，每个屋子用5种不同类型屋顶之一
g、p、s、t、w
写条件：
1、≥1 （表示每种屋顶至少被使用一次）
2、w→（ws）/（sws） （表示有W，则W和至少一个S相邻）
3、～（w/s t） （表示W,S不和t相邻）
4、g→(g t/p)/(tgp) （表示有g,则g和t,p至少一个相邻）
5、s≠4,9 （表示4,9不能为S）
条件总结：
由条件1知，每种屋顶至少被使用一次，
所以对条件2，条件4来说，必然存在w,g，充分条件可转化为一种固定的必然条件，
对W：一定有(ws)/（sws）
对g：一定有(g t/p)/(tgp)
如果4,5=w，并且如果1,8=p，那么9是什么？
1 2 3 4 5 6 7 8 9
p s w w s p
1、由(ws)/(sws)得，3,6=s，还剩下2个元素t,g，它们中必然要
在2,7,9中找到自己的位置
2、由条件3：～(w/s t)得，t≠2,7，所以t=9
A museum manager must assign security guards to guard a
four-day exhibit, lasting from Wednesday through Saturday.
Exactly two guards must be assigned to be on duty together
on each of the four days. The manager has eight guards—
Gail, Helena, Jose, Kiel,Lamar, Mary, Pam, and Ralph—to
assign. Each guard must be assigned, and guard assignments
are subject to the following condition:
Ralph cannot be assigned to the Saturday shift.
Gail cannot be assigned to the same day as Jose.
Gail cannot be assigned to the Thursday shift.
Jose must be assigned to either the Wednesday or the Saturday shift
Kiel must be assigned to the same day as Mary.
Pam must be assigned to the Thursday shift.
If Gail is assigned to the Saturday shift, which of
the following must be assigned to the Wednesday shift?
Helena
Jose
Kiel
Lamar
Ralph
————————————————————————
答案：(B)
If Kiel is assigned to the Saturday shift, which of
the following must be true?
Gail is assigned to the Friday shift.
Helena is assigned to the Wednesday shift.
Jose is assigned to the Saturday shift.
Lamar is assigned to the Friday shift.
Ralph is assigned to the Thursday shift.
————————————————————————
答案：(A)
If Kiel is assigned to the Friday shift. which of
the following is a pair of guards who can be assigned
to the Wednesday shift?
Gail and Helena
Gail and Pam
Helena and Lamar
Jose and Mary
Lamar and Ralph
————————————————————————
答案：(A)
If Mary is assigned to the Wednesday shift, which
the following must be true?
Gail is assigned to the Friday shift.
Helena is assigned to the Saturday shift.
Jose is assigned to the Wednesday shift.
Ralph is assigned to the Thursday shift.
Ralph is assigned to the Friday shift.
————————————————————————
答案：(A)
If Gail and Helena are assigned to the Wednesday
shift, which of the following is the pair of guards
who must be assigned to the Saturday shift?
Lamar and Ralph
Kiel and Mary
Jose and Ralph
Jose and Mary
Jose and Lamar
————————————————————————
答案：(E)
For the United States meat industry, there is good
news and bad news. The bad news is that over the last
three years people in the United States have been eating
less meat. The good news, is that during this same time
period meat producers' profits have risen steadily.
Which of the following, if true during the last three
years, contributes most to a resolution of the apparent
discrepancy above?
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