Passage Two听录音，回答以下问题：
20、A.Customers may get addicted to the smells.
B.Customers may be misled by the smells.
C.It hides the defects of certain goods.
D.It gives rise to unfair competition.
21、A.Flexible.
B.CriticA..
C.Supportive.
D.Cautious.
22、A.The flower scent stimulated people’s desire to buy.
B.Stronger smells had greater effects on consumers.
C.Most shoppers hated the smell in the shoe store.
D.84%of the customers were unaware of the smells.