GRE数学：网络课堂逻辑笔记（6）
<p> <span word="Passage">Passage</span> 6</p><p> <span word="Two">Two</span> <span word="male">male</span> <span word="singers">singers</span>, <span word="P">P</span> <span word="and">and</span> <span word="S">S</span>; <span word="two">two</span> <span word="female">female</span> <span word="singers">singers</span>, <span word="R">R</span> <span word="and">and</span> <span word="V">V</span>; <span word="two">two</span> <span word="male">male</span> <span word="comedians">comedians</span>, <span word="T">T</span> <span word="and">and</span> <span word="W">W</span>; <span word="and">and</span> <span word="two">two</span> <span word="female">female</span> <span word="comedians">comedians</span>, <span word="Q">Q</span> <span word="and">and</span> <span word="U">U</span>, <span word="are">are</span> <span word="the">the</span> <span word="eight">eight</span> <span word="entertainers">entertainers</span> <span word="who">who</span> <span word="are">are</span> <span word="to">to</span> <span word="perform">perform</span> <span word="at">at</span> <span word="the">the</span> <span word="Stuart">Stuart</span> <span word="heater">heater</span> <span word="on">on</span> <span word="a">a</span> <span word="certain">certain</span> <span word="night">night</span>. <span word="Each">Each</span> <span word="entertainer">entertainer</span> <span word="is">is</span> <span word="to">to</span> <span word="perform">perform</span> <span word="alone">alone</span> <span word="and">and</span> <span word="only">only</span> <span word="once">once</span> <span word="that">that</span> <span word="night">night</span>. <span word="The">The</span> <span word="entertainers">entertainers</span> <span word="may">may</span> <span word="perform">perform</span> <span word="in">in</span> <span word="any">any</span> <span word="order">order</span> <span word="that">that</span> <span word="conforms">conforms</span> <span word="to">to</span> <span word="the">the</span> <span word="following">following</span> <span word="restrictions">restrictions</span>:</p><p> <span word="The">The</span> <span word="performances">performances</span> <span word="by">by</span> <span word="singers">singers</span> <span word="and">and</span> <span word="the">the</span> <span word="performances">performances</span> <span word="by">by</span> <span word="comedians">comedians</span> <span word="must">must</span> <span word="alternate">alternate</span> <span word="throughout">throughout</span> <span word="the">the</span> <span word="evening">evening</span>.</p><p> <span word="The">The</span> <span word="first">first</span> <span word="performance">performance</span> <span word="that">that</span> <span word="evening">evening</span> <span word="must">must</span> <span word="be">be</span> <span word="by">by</span> <span word="a">a</span> <span word="female">female</span> <span word="entertainer">entertainer</span>, <span word="and">and</span> <span word="the">the</span> <span word="second">second</span> <span word="performance">performance</span> <span word="by">by</span> <span word="a">a</span> <span word="male">male</span> <span word="entertainer">entertainer</span>.</p><p> <span word="The">The</span> <span word="final">final</span> <span word="performance">performance</span> <span word="must">must</span> <span word="be">be</span> <span word="by">by</span> <span word="a">a</span> <span word="male">male</span> <span word="singer">singer</span>.</p><p> 1. <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="could">could</span> <span word="be">be</span> <span word="the">the</span> <span word="last">last</span> <span word="of">of</span> <span word="the">the</span> <span word="entertainers">entertainers</span> <span word="to">to</span> <span word="perform">perform</span>?</p><p> <span word="R">R</span> <span word="S">S</span> <span word="T">T</span> <span word="V">V</span> <span word="W">W</span></p><p> 2. <span word="Which">Which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="could">could</span> <span word="be">be</span> <span word="the">the</span> <span word="first">first</span> <span word="of">of</span> <span word="the">the</span> <span word="entertainers">entertainers</span> <span word="to">to</span> <span word="perform">perform</span>?</p><p> <span word="P">P</span> <span word="R">R</span> <span word="U">U</span> <span word="V">V</span> <span word="W">W</span></p><p> 3. <span word="If">If</span> <span word="R">R</span> <span word="is">is</span> <span word="to">to</span> <span word="perform">perform</span> <span word="fourth">fourth</span>, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="must">must</span> <span word="perform">perform</span> <span word="sixth">sixth</span>?</p><p> <span word="P">P</span> <span word="S">S</span> <span word="U">U</span> <span word="V">V</span> <span word="W">W</span></p><p> 4. <span word="If">If</span> <span word="U">U</span> <span word="is">is</span> <span word="to">to</span> <span word="perform">perform</span> <span word="seventh">seventh</span>, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="must">must</span> <span word="perform">perform</span> <span word="first">first</span>?</p><p> <span word="Q">Q</span> <span word="R">R</span> <span word="S">S</span> <span word="T">T</span> <span word="V">V</span></p><p> 5. <span word="If">If</span> <span word="P">P</span> <span word="is">is</span> <span word="to">to</span> <span word="perform">perform</span> <span word="eighth">eighth</span>, <span word="which">which</span> <span word="of">of</span> <span word="the">the</span> <span word="following">following</span> <span word="must">must</span> <span word="perform">perform</span> <span word="second">second</span>?</p><p> <span word="R">R</span> <span word="S">S</span> <span word="T">T</span> <span word="V">V</span> <span word="W">W</span></p><p> 6. <span word="If">If</span> <span word="T">T</span> <span word="is">is</span> <span word="to">to</span> <span word="perform">perform</span> <span word="third">third</span>, <span word="W">W</span> <span word="must">must</span> <span word="perform">perform</span></p><p> <span word="first">first</span> <span word="or">or</span> <span word="fifth">fifth</span> <span word="second">second</span> <span word="or">or</span> <span word="fifth">fifth</span></p>
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