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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.

51.What is this passage mainly about?

• A、A World Fair held in Chicago in 1893.

• B、The popularity of the American candy bar industry.

• C、The candy bar industry during World War I.

• D、The spread of the candy bar business to the Midwest.