Where are people who leave the northeast and midwest going? They are moving south and west, another broad trend. In general, people are moving to where it's warmer, less expensive and less crowded, or where jobs are more plentiful in growing service industries like health care, in the technology sector, or in factories that moved from the northeast or midwest.

　　In a sense, the computer chips of San Jose, the new 10th largest city, in the heart of what is known as Silicon Valley, have replaced the sheet metal and molten steel of Detroit as the symbol of American economic power.

　　13．The main difficulty that Detroit is now facing is _____.

　　A．the factory closings and huge job losses

　　B．many people’s moving to the south and west

　　C．the poor quality of the automobile

　　D．the lack of the computer chips

　　14．Which of the following isn’t the trend of the change?

　　A．The decline of the manufacturing economy.

　　B．Companies’ moving overseas.

　　C．The end of the US cities’ development.

　　D．The migration of Americans to the south and west.

　　15．Which statement is not correct according to the passage?

　　A．Detroit has been on the list of the Top 10 most populous US cities for over a century.

　　B．People immigrate south and west to take advantage of lower wages there.

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