First-borns tend to be conservative（保守的）， ambitious and close to their parents. Those coming later have to make a conscious effort to be different in order to successfully compete for their parents’ attention.As a result， the youngest children tend to end up history’s great risk-takers， rebels（叛逆者）or movers and shakers.
“This kind of relationships is really the key personality-forming relationships of all our lives，” said Ms Sauers， a secondary school teacher. “The relationships are generally the longest relationships we have; they go from childhood to old age.”
“A lot of people feel those relationships really ground them because， with brothers and sisters， you can’t get away with anything bad.”
“As for Joe， Rosie and Matilda， their daily battles over clothes， musical instruments， who performs best in sport and parental love are as regular as any other kids.”
“And considering who their mum and dad are， they’re very normal and unaffected.”
68. What do the underlined words “ground them” mean?
A. monitor them B. surround them C. keep them D. worry them
69. Which of the following is wrong according to the passage?
A. Children envy each other and can’t get along well enough.
B. Joe， Matilda and Rosie’s parents are mentioned in the passage.
C. Bryan Brown and Rachel Ward are the three children’s parents.
D. Actors Bryan Brown and Rachel Ward are asked to act Joe， Matilda and Rosie’s parents.
70. What’s the readers’ impression about Joe Brown after reading the passage?
A. Joe Brown doesn’t like to go back when he comes to see his big sisters Rosie and Matilda.
B. The little brother Joe Brown is a little backward compared with his big sisters.
C. Joe Brown is ready to say something ill about his big sisters.
D. Young as Joe Brown is， he isn’t forward and actually is as backward as his big sisters.
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Called the “embodiment（化身）of pure intellect（智力）”， Albert Einstein has long been considered one of the most brilliant men who ever lived. During his life， and ever since his death， people everywhere have wondered how one man could have possessed such genius.
Now， over 50 years since he died， a new study by Falk of Florida State University， US， has uncovered more about the physicist’s brain， thanks to some newly presented photos.
When Einstein died in 1955 at the age of 76， a scientist named Thomas Harvey removed Einstein’s brain and preserved it. Harvey sliced（切片）the brain into hundreds of pieces and took 14 photos from several angles. Harvey showed these brain slices to the public， but kept the photos private.
The displayed brain slices allowed scientists a glance into the source of Einstein’s genius， but the findings were very limited. In 1999， for example， researchers at McMaster University， US， compared Einstein’s brain with those of about 90 normal people and found that “one area of his brain was significantly different from most people’s”.
Three years after Harvey died， his family finally donated the 14 photos to the National Museum of Health and Medicine in WashingtonDC in 2010. Falk and her team began analyzing the photos in 2011 and have made out several previously unrecognized unusual things.
In the new study， published Nov 16 in the magazineBrain， Falk found that the size and shape of Einstein’s brain are both normal， but the brilliant physicist had extra folding in his brain’s gray matter， which is responsible for conscious thinking. Scientists believe that more folding creates more connections between distant brain cells， allowing one to make mental leaps（跳跃）more easily.
In addition， a part called the frontal lobes（脑前叶）， which plays a key role in abstract（抽象）thought， also had unusual folding. This may have helped Einstein develop the theory of relativity.
“He did thought experiments where he’d imagine himself riding alongside a beam of light， and this is exactly the part of the brain one would expect to be very active in such thought experiments，” Falk told Live Science.
However， scientists are still puzzled: Was Einstein’s brain extraordinary from birth or did years of pondering（思索）physics make it that way? Falk believes both played a role. “He was born with a very good brain， and he had the kinds of experiences that allowed him to develop the potential he had，” she said.
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