Little Mark is only 6, but he has an IQ of 200, a genius among geniuses. But his intelligence comes at a cost. His parents must keep him intellectually simulated（启发）while making sure he is like any other little boy.
Mark has been attracted by the way how the world works since he was a baby. When he was 3, Mark was reading fluently, mostly self-taught. His parents haven't been able to keep him away from books since.
"I tried many times to stop him reading. We worry about his crazy fond of reading because he constantly wants to read every-thing whatever it is.”
A psychologist at the Centre for gifted children tested Mark and gave him an IQ of 200. The average child of Mark's age has an IQ of 100. At 200, Mark is a genius-even compared with other child geniuses.
"With children like Mark you can tell that's a bright child as soon as they walk in. They just have this sort of intensity, and maybe they're not so good at communicating with people," the psychologist said. "He will never fit perfectly into a class where he's with children of his age.”But Mark's mother worries about the "socially isolated" labels. "Nobody wants their child to grow up with that image. I want him to communicate with others freely, but not to be frustrated academically, so it's really hard to find a balance," she says.
Helen Dudeney from the Talented and Gifted Children Association says Mark is one in a million with such a high IQ. She points out that geniuses are still rare and difficult for the public education system to handle. "The lack of coping comes because teachers aren't trained in teaching gifted children," says Dudeney.
Helen believes it's also extremely important for them to be recognized and supported in their talents. Mark's parents are trying to figure out how best to help Mark. At the moment, there are few options. Mark finds first year work boring and simple, but he must learn to complete the work. His mother says, "We just want to be happy. Just to have a happy childhood and want to go to school every day.”
By saying "But his intelligence comes at a cost. ",the author means that        

A．Mark must pay for his intelligence at a high price

B．Mark's intelligence brings him negative effects at the same time

C．Mark's intelligence results from his parents

D．Mark's parents make Mark clever at all costs

Which of the following is NOT true according to the passage?      

A．Mark's parents are very satisfied with his love for reading.

B．Mark began to teach himself reading at the age of 3.

C．Many child geniuses are not good at communicating with others.

D．It is hard for parents to bring up a genius.

If there are 6. 6 billion people in the world, the number of geniuses with an IQ of 200 will be
________．

A．about 4,400

B．about 5,500

C．about 6,600

D．about 7,700

What would be the best title for the passage?        

A．A genius' craziness for books

B．The life of the genius' parents

C．The burden of being gifted

D．The characteristics of Mark

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