There will be seven performers in a talent show: a guitarist, a hypnotist, a juggler, a magician, a pianist, a singer, and a ventriloquist. Exactly three of the performers—the guitarist, the pianist, and the singer—will each require a recorded musical accompaniment. The schedule for the show has seven consecutive time slots. Each of the seven performers will appear in exactly one time slot, and each time slot will have exactly one performer appearing in it. The schedule must follow the rules below:
The juggler must appear first.
The ventriloquist cannot appear immediately after the magician.
At most two performers requiring a recorded musical accompaniment can appear in succession.
Which of the following is an acceptable schedule for the last four performers in the show¡
Fourth Fifth Sixth Seventh
Juggler Hypnotist Guitarist Pianist
Guitarist Magician Ventriloquist Singer
Magician Pianist Singer Guitarist
Singer Guitarist Pianist Hypnotist
Ventriloquist Hypnotist Magician Singer
答案：(E)
这是一道非常简单的排列题，但是分析题在于你会不会做，而在于你花了几分钟把它做完，在于速度。我们通过讲解几道题来体会一下如何迅速定位答案。
读题：7个表演者g,h,j,m,p,s,v参加表演，其中3个g,p,s有音乐伴奏。有7个位置，一人一个。
写条件：
1、j=1 (表示j在第一个位置)
2、～mv (表示v不能出现在m的后面)
3、～(gps) (表示需要音乐伴奏的3人中最多只有2人连续)
条件总结：
**注意g.p.s为等价元素（当然，如果在问题中又出现新的限制条件后，就不一定是）
If the ventriloquist appears third, the singer appears fifth, and the pianist appears sixth, which of the following must be true¡
The guitarist appears second.
The guitarist appears fourth.
The hypnotist appears second.
The magician appears fourth.
The magician appears seventh.
答案：(A)
If the singer appears third and the pianist appears fourth, the guitarist must appear either first or second
second or fifth
second or seventh
fifth or sixth
sixth or seventh
答案：(E)
If the ventriloquist appears fifth and the hypnotist appears sixth, which of the following must be true¡
The guitarist appears either third or seventh.
The magician appears either second or third.
The pianist appears either second or fourth,
The singer appears either second or seventh.
The singer appears either third or fourth.
答案：(B)
如果v=5，h=6，下面哪一个一定正确？
解题步骤：
1、v=5，条件2：～mv，∴m≠4，
2、扫一下选项，选项中都是元素在哪些位置，还剩4个元素，m,g,p,s, g,p,s为等价元素,所以g,p,s的位置只可能为 can be true, 不可能must be true？因此涉及gp，s的都不正确。只有B正确。当然也可用常规方法做，得到m≠4后，还剩4个元素，m,g,p,s, 还有一个条件没有用,～（gps），因此g,p,s不可能占据2,3,4三个连续位置，必有一个在7，m就必须在2/3
1 2 3 4 5 6 7
j v h
If the hypnotist appears sixth and the magician appears seventh, who of the following must be true¡
The ventriloquist appears third or fourth.
The singer appears fourth or fifth.
The juggler immediately precedes the pianist.
The pianist immediately precedes the guitarist.
The singer immediately precedes the hypnotist.
答案：(A)
如果h=6，m=7，下面哪一个一定正确？
解题步骤：
1、选项中涉及都是具体位置信息，g,p,s为等价元素，只剩下元素v，答案马上定位到A
2、常规方法，4个元素g,p,s,v, 一个条件～(gps)，所剩位置是2，3，4，5，为使它们不能连续，v绝对不能放在两头2/5，v只能放中间3/4。
What is the total number of different time slots into any one of which the singer can be scheduled¡
3
4
5
6
7
答案：(D)
If all of the performers requiring musical accompaniment appear before the magician, who appears sixth, each of the following could be true EXCEPT that the
guitarist appears fifth
hypnotist appears fourth
pianist appears second
singer appears fourth
ventriloquist appears third
答案：(B)
如果所有有音乐伴奏的表演者出现在m之前，m=6，下面哪一个可能正确 EXCEPT
解题步骤：
1、问题用的语气是 can be true EXCEPT, 其实还是一种must be true的问法。选了它就一定违反原文中的条件或题目中加的新条件。
2、m=6，条件2：～mv，所以v在m前面，v<6题中附加条件有g,p,s在m前面，而m前面一共还有2,3,4,5 共4个位置，放gpsv 四个元素，剩下一个元素h=7，故选（B）
3、本题还可以稍加变化，把v=2/5作为答案，这就等于又考了一下第5题。g,p,s,v在（2,3,4,5), v不能放两头。
The equity for women bill was narrowly defeated several times in a countrys legislature. Thirty-three votes were required for passage. Thirty-two members of the legislature voted for the bill in 1985, whereas only 30 legislators voted for it in 1987. This was true even though no legislators changed their votes.
Which of the following, if true, best explains why the number of votes for the bill changed from 32 in 1985 to 30 in 1987 ¡
In 1985 the effort to pass the bill was led by an influential, experienced legislator, whereas in 1987 the effort was led by a little-known, inexperienced legislator.
There was an election in 1986 in which two legislators who supported the bill lost their seats in the legislature and no one who supported the bill was newly elected.
There was an election in 1986 in which a party leader who did not support the bill was reelected and the party that was in power lost a seat in the legislature.
In 1986 an
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