Psychologists have also argued that digital technology is changing the way we think．They pointprocessors they can edit as they go along．

　　A study by the Broadcaster Audience Board found teenagers now spend seven and a half hours a day in front of a screen．Educational psychologist Jane Healy believes children should be kept away from computer games until they are seven．Most games only excite the "flight or fight" areas of the brain, rather than the areas responsible reasoning．

　　Sue Palmer, author of Toxic Childhood, said: "We are seeing children's brain development damaged because they don't engage in the activity they have engaged in for thousands of years．I'm not against technology and computers．But before they start social networking, they need to learn to make real relationships with people．"

　　50．According to the passage, social networking websites might _____．

　　A．encourage young users constant satisfaction

　　B．lengthen young users' attention span

　　C．make young users more selfish

　　D．help young users communicate better with their families

　　51．A neuroscientist may worry that sites like acebook may ______．

　　A．help children learn to make real relationships with people in society

　　B．encourage students not to plan their term papers before starting to write

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