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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.

44.What do Americans feel about using credit cards nowadays according to the passage?

• A、They consider it valuable.

• B、They regard it as a shame.

• C、They think it dangerous.

• D、They find it quite convenient.