12．Which of the following is RIGHT according to the passage?

　　A．The actual age looks more important than biological age.B．People can change their genetics by enough exercising.C．The present soil is short of important minerals. D．A strain and blood sugar have a bad effect on bodies.Maps and statistics can tell us a lot about where a country is headed. Take the US Census Bureau's latest findings on American cities. They show that for the first time since 1900, Detroit is not on the list of the Top 10 most populous US cities. In its place is San Jose, California.

　　Detroit has been the long-time centre of the US auto industry, but in the past few years the "Big Three" US automakers － General Motors, Ford, and Chrysler － have closed plants and laid off workers. With the factory closings and huge job losses, Detroit cannot collect enough tax revenue to pay its bills, forcing it to close schools and lay off city workers. Cutbacks then cause others to flee the city.

　　"It's part of a pattern for the heavily industrialized cities," says Dana Johnson, an economist in Detroit. "There's been an ongoing dynamic (变化) here of people fleeing the city looking for better schools, better lifestyles, better services."

　　Detroit is hardly alone. After World War II, the US was the world's leading manufacturer. Cars, televisions, toys, and clothing made in America were exported around the world. As a result, the well-paid factory workers formed the backbone of a rising middle class. In the last three decades, the US economy has changed. Companies have moved factories overseas to take advantage of lower wages in Asia, Latin America, and Eastern Europe.

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