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听第9段材料，回答第13至15题。
13. What makes shoppers tired?
A. Queuing for electrically-driven cars.
B. Looking for what they want to buy.
C. Carrying shopping around.
14. What is the problem for building moving walkways in the store?
A. The space.
B. The redesign.
C. The technology.
15. Where will the computer system send the things shoppers buy?
A. To the exit.
B. To the shelf.
C. To the shoppers' homes.
第三节 （共5小题；每小题1.5分，共7.5分）
听下面一段对话，完成第16至第20五道小题，每小题仅填写一个词。听对话前，你将有20秒钟的时间阅读试题，听完后你将有60秒钟的作答时间，这段对话你将听两遍。
