If Roland appears in the first skit and then does not appear in the next
* I. q: ^2 Y) V+ E, N/ i+ }- P4 Ifour skits, which of the following must be the cast in at least two of the # D C8 p5 M+ N" k$ o) l
first five skits?
; d" r0 ?0 h0 m" }/ Q' w% V& `& b, C7 Q Ⅰ Simon alone
B: o: ]4 @; Y$ b( N Ⅱ Theresa alone
: t3 E x4 @% i0 e7 } Ⅲ Simon and Theresa together * [/ N! @, G, [7 ~# p8 h" Q4 i
Ⅰ only
# ^( j0 B8 X' m/ j1 l2 D Ⅲ only
( Z: {: |/ C5 [/ P7 q/ {1 d% F( [ Ⅰand Ⅱ only
+ }, k m1 x5 W! ? Ⅱ and Ⅲ only ( _$ X0 J' F+ Q; r; H+ r1 d& p. g
ⅠⅡ and Ⅲ
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答案:(B) 8 _, x9 Y# S+ |9 a& p# ~
& o4 ^3 J# Z" \% _( Y' GWhich of the following specifies the greatest number of skits, of which no : Z) b- R8 I: M& L1 j3 s2 A
two have the same cast that could appear consecutively on the program? $ ~1 ~: ]8 `. B \) E: o
5
# d" o0 S O% L3 J 6 Y3 r( j% U+ z/ k
7 u# C4 j" U5 M, }, S( h
8 7 c4 n9 _7 a/ M
9
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答案:(C)
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If in the first five skits Roland and Simon each appear exactly twice as ' v+ @: b5 v( ~1 `! ?; u2 a
many times as does Theresa, which of the following must be true?
2 C8 ]! ?4 @) B- ]& z# m8 ^3 C Roland and Simon appear together in the first skit.
( |! D4 I2 b" d4 j4 y j Roland and Theresa appear together in the second skit. 5 H4 _4 g" a/ a7 ~
Simon and Theresa appear together in the fourth skit. $ X# ], ]2 r0 k& ^, Z
Theresa appears with at least one of the other actors in each of her skits. 2 y* n a5 r4 N# C8 H
Simon appears with at least one of the other actors in each of his skits.
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答案:(D) |