15. What can be inferred from the passage?
(A) Businesses should consider packaging their products as a set.
(B) Businesses should lower prices by selling a set.
(C)Customers should learn to buy more.
(D) Customers should ask companies to design different products.
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統計: A(512), B(78), C(71), D(95), E(0) #1767345
統計: A(512), B(78), C(71), D(95), E(0) #1767345