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48.Why did M.S.Hershey start the production of chocolate bars?

• A、He was deeply impressed by the Columbian Exposition.

• B、He realized that it was possible for chocolate to become popular.

• C、There was nothing to produce in his factory in Lancaster.

• D、He was interested in the chocolate machinery displayed at the fair.

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45.Why does the car rental company ask for the credit card number?

• A、To prevent the overuse of the car.

• B、To make sure that the car won't be damaged.

• C、To make sure the user return the car and pay for using it.

• D、To ensure that the car is safely and timely returned.