The importance of the product life cycle to marketers is this：Different stages in the product life cycle call for different strategies.The goal is to extend product life so that sales and profits do not decline.One strategy is called market modification.It means that marketing managers look for new users and market sections.Did you know，for example，that the backpacks that so many students carry today were originally designed for the military?

　　Market modification also means searching for increased usage among present customers or going for a different market，such as senior citizens.A marketer may re－position the product to appeal to new market sections.

　　Another product extension strategy is called product modification.It involves changing product quality，features，or style to attract new users or more usage from present users.American auto manufacturers are using quality improvement as one way to recapture (夺回) world markets.Note，also，how auto manufacturers once changed styles dramatically from year to year to keep demand from falling.

　　41．According to the passage，when people grow fond of one particular brand of a product，its sales will________.

　　A．decrease gradually

　　B．become unstable

　　C．improve enormously

　　D．remain at the same level

　　42．The first paragraph tells us that a new product is________.

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