单项选择题

To the manufacturers, the most important use of advertisements is that advertisements

A．tell the customers what products are in store
B．tell the customers what to buy
C．help the manufacturers sell products
D．convince the customers to buy a lot of things they don't need
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单项选择题
It can be inferred from the passage that _________.
A．people don't buy a product until they are motivated by the advertisements on it
B．manufacturers want people to buy their products because of rational motives
C．the products displayed within easy reach are sold better than those displayed on the bottom shelves
D．the products displayed on the top shelves are sold better than those displayed on the bottom shelves
单项选择题
Which of the following can be inferred from the passage
A．There are useful viruses as well as harmful ones.
B．Many virus checking software is free of charge.
C．Even if you take the advice, your computer may still be infected with viruses.
D．Shut down your computer whenever there is a virus.
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