The organizers of tomorrows outdoor concert announced that it will go on tomorrow on schedule unless bad weather is forecast or too few advance tickets are sold. If the concert is canceled, refunds will be made to ticket holders. Since some ticket holders have already been issued refunds even though more than enough advance tickets were sold, it must be the case that bad weather is forecast.
Which of the following is an error of reasoning con- tained in the argument?
It proceeds as if a condition, which by itself is enough to guarantee a certain result, is the only condition under which that result would occur.
It bases a conclusion that is known to require two conditions on evidence that bears on only one of those conditions.
It explains one event as being caused by another event, even though both events must actually have been caused by some third, unidentified event.
It treats evidence for the absence of one condi-tion under which a circumstance would occur as conclusive evidence that that circumstance will not occur.
Evidence given to support the conclusion actually undermines it.
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2014人教新目标英语八下unit 3《Could you please clean your room》section a 2a课本听力素材（mp3）
2014人教新目标英语八下unit 3《Could you please clean your room》 period 5课件
2014人教新目标英语八下unit 3《Could you please clean your room》period 2课件
2014人教新目标英语八下unit 10《I’ve had this bike for three years》专题复习课件
2014人教新目标英语八下unit 3《Could you please clean your room》period 4课件
2014人教新目标英语八下unit 3《Could you please clean your room》period 1课件
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b 2b课本听力素材（mp3）
2014人教新目标英语八下unit 10《I’ve had this bike for three years》课件3
2014人教新目标英语八下unit 3《Could you please clean your room》 period 2课件
2014人教新目标英语八下unit 1《What’s the matter》section a 3a-4c（含grammar focus）课件
2014人教新目标英语八下unit 1《What’s the matter》section a 3a课本听力素材（mp3）
2014人教新目标英语八下unit 1《What’s the matter》section a 1a-2d课件
2014人教新目标英语八下unit 2《I’ll help clean up the city parks》课件
2014人教新目标英语八下unit 1《What’s the matter》words单词听力朗读素材（mp3）
2014人教新目标英语八下unit 10《I’ve had this bike for three years》课件
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b 3a-3b（含self check）课件
2014人教新目标英语八下unit 3《Could you please clean your room》period 3课件
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b课件
2014人教新目标英语八下unit 3《Could you please clean your room》section a 2b课本听力素材（mp3）
2014人教新目标英语八下unit 1《What’s the matter》section a 2b课本听力素材（mp3）
2014人教新目标英语八下unit 1《What’s the matter》section a 2a课本听力素材（mp3）
2014人教新目标英语八下unit 1《What’s the matter》section b 3a-3b（含self check）课件
2014人教新目标英语八下unit 3《Could you please clean your room》section a 1b课本听力素材（mp3）
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b 1b课本听力素材（mp3）
2014人教新目标英语八下unit 1《What’s the matter》period 1课件
2014人教新目标英语八下unit 2《I’ll help clean up the city parks》复习课件
2014人教新目标英语八下unit 1《What’s the matter》section b 1c课本听力素材（mp3）
2014人教新目标英语八下unit 10《I’ve had this bike for three years》section b 1c课本听力素材（mp3）
2014人教新目标英语八下unit 1《What’s the matter》section b 2b课本听力素材（mp3）
2014人教新目标英语八下unit 1《What’s the matter》period 4课件