三、完形填空(共15小题;每题2分，共30分。) 通读下面的短文，掌握其大意。然后，从每小题的四个选择项中选出可填入相应空白处的最佳选项。
Everyone likes things that are free，and businesses often give things for free to customers as a way of getting more people to pay attention to their products.
Ariely，a scientist from MIT，did an experiment on what people would do when 21__________ things that were free.He 22__________ a group of students two kinds of chocolates:the good one for 15 cents each and the poor one for 1 cent each.The good chocolate was worth$1.00，so 15 cents was very cheap，23__________ the poor quality chocolate was worth 5 cents，so 24 __________ it for 1 cent wasn’t very cheap.
Most people chose the high quality chocolate for 15 cents.That’s not a 25__________.But then Ariely lowered the 26__________ of both pieces of chocolate by 1 cent.If people were 27__________ correctly，then they should 28 __________ choose the good quality chocolate.But that 29 __________ what happened.Most people chose the free chocolate.This doesn’t make sense in our 30__________ way of understanding economic behavior(经济行为).
What is happening here?Ariely 31 __________ that people want to get a good bargain，but they also want to reduce risk(风险).That is，they want to 32__________ the chance of making a 33__________.If you pay 14 cents for a piece of chocolate，and then you don’t 34__________ like it when you eat it,you have lost 14 cents.But when something is free and you don’t like it，you haven’t lost anything.People would 35__________ not to take a risk over getting a better bargain.
第21题请选择最佳选项( )。
A. facing
B. buying
C. giving
D. treating
【正确答案】A
第22题请选择最佳选项( )。
A. posted
B. produced
C. offered
D. told
【正确答案】C
第23题请选择最佳选项( )。
A. if
B. as
C. for
D. but
【正确答案】D
第24题请选择最佳选项( )。
A. getting
B. holding
C. eating
D. making
【正确答案】A
第25题请选择最佳选项( )。
A. dream
B. reason
C. reply
D. surprise
【正确答案】D
第26题请选择最佳选项( )。
A. weight
B. size
C. price
D. quality
【正确答案】C
第27题请选择最佳选项( )。
A. working
B. thinking
C. planning
D. looking
【正确答案】B
第28题请选择最佳选项( )。
A. still
B. once
C. almost
D. even
【正确答案】A
第29题请选择最佳选项( )。
A. should be
B. shouldnt be
C. is
D. isnt
【正确答案】D
第30题请选择最佳选项( )。
A. easy
B. old
C. normal
D. modern
【正确答案】C
第31题请选择最佳选项( )。
A. questioned
B. explained
C. agreed
D. added
【正确答案】B
第32题请选择最佳选项( )。
A. find
B. learn
C. lower
D. take
【正确答案】C
第33题请选择最佳选项( )。
A. decision
B. mistake
C. promise
D. warning
【正确答案】B
第34题请选择最佳选项( )。
A. usually
B. gradually
C. certainly
D. actually
【正确答案】D
第35题请选择最佳选项( )。
A. start
B. prefer
C. manage
D. afford
【正确答案】B
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