Learning How to Learn $ 22 Children who read this book show great interest in study. Many pictures will help them u

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问题                                            Learning How to Learn $ 22
          Children who read this book show great  interest in study. Many pictures will help them  understand it easily and quickly.     
             The Basic Study Guidebook $ 36
         Read this book and learn:
         What the three barriers (障碍) to study are and what to do about them
         What to do if you are tired of a subject
   Children read it to improve the ability to study.   
      How to Use a Dictionary Picture Book for Children $ 35
         Read this book and learn:
         How to look up words in a dictionary
         What the different marks in a dictionary mean
         How to use a dictionary to pronounce words correctly
         Buy this book and help children unlock their education. What’s more, you’ll just pay 60% for it    before May 10, 2009.  
If you buy the three books on May 2nd, 2009, you will just pay ______ for them.

选项 A、93
B、71
C、80
D、79

答案D

解析 由第三个框中书的简介部分最后一句可知,在2009年5月10日之前买第三本书可享受六折优惠,故35×60%+36+22=79,故D项正确。
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