Research shows that much of  our predisposition (倾向) towards determination, sociability and selfcontrol and sense of purpose is in our genes. In  fact, our DNA plays a bigger role in influencing these traits (characteristics) than our upbringing (儿童期的教养) and the company we keep.  Taken together, these aspects of personality can make the difference between success and failure, say the Edinburgh University researchers.
They questioned more than 800 pairs of twins about  their attitudes to life to tease apart the influences of nature  and nurture. Comparing identical twins, who share all their  DNA and their upbringing, with nonidentical twins, who  have a shared background but are no more genetically alike  than other brothers and sisters, is a technique often used  by researchers to quantify the influence of genetics.
The results, published in the Journal of Personality,  showed that genes play a much bigger role than lifestyle,  with selfcontrol particularly etched (铭刻) into our DNA.
Our genes also largely determine how determined and persistent we are. This is important in terms of success, as someone who refuses to give up is more likely to achieve their dreams than someone_who_throws_in_the_towel_at_the_first_hiccough.
Researcher Professor Timothy Bates said, “Ever since the ancient Greeks, people have debated the nature of a good life and the nature of a virtuous life. Why do some people seem to manage their lives, have good relationships and cooperate to achieve their goals while others do not? Previously, the role of family and the environment around the home often controlled people's ideas about what affected psychological wellbeing. However, this work emphasizes a much more powerful influence from genetics.”
However, those who haven't been dealt a helpful hand of genes shouldn't be too depressed. The professor says a sense of purpose is the key and advises those who are eager for success to focus their thoughts on making a difference.
What does the result of the research indicate?

A．Our DNA is the only factor to decide our traits.

B．Our DNA plays a decisive role in achieving success.

C．Education plays little part in the formation of our character.

D．Society has little effect on us in our personality.

The underlined part in Paragraph 4 refers to someone   who ________.

A．is born successful

B．determines to make a difference

C．makes great effort

D．admits defeat easily

Timothy Bates mentions the ancient Greeks in order to   indicate that ________.

A．some people can live a good life because they can manage their lives

B．people haven't made it clear yet what is the key personality trait to be a success

C．in ancient Greece the role of family and the environment was ignored

D．the relationship between personality and success has always been people's concern

According to the passage, the key personality trait is ________.

A．determination	B．kindness
C．politeness	D．sociability

What is the best title for the passage?

A．How do people work hard?

B．Why can some people succeed?

C．DNA determines success or failure.

D．Several factors determine personality.