题目内容：

Career criminals begin their antisocial behavior during their toddler (学步的儿童) years and may go on with a life of crime if their behavior isn’t challenged, scientists have discovered. While most children grow out of their bad behavior by adulthood, a study found those who had “callous unemotional (冷漠无情的) characteristics” could grow up to have problems with the law later in life. Behavior characteristics such as a lack of sympathy and lying in childhood could have an impact years on.

Luke Hyde, assistant professor of psychology at the University of Michigan, said, “These are signs for parents and doctors to watch out for, as they may signal more than just the terrible twos.” He said, “Parents both take care of their child and provide their child’s genes so it’s been difficult to know if we’re seeing that parenting causes callous unemotional behaviors, or if it is just a sign of the genes being passed to the child.”

The research also discovered that strict parenting is linked to the development of antisocial behavior. Scientists looked at 561 families in an adoption study that examined biological mothers’ antisocial behavior. The scientists found children of antisocial mothers were also more likely to exhibit the same behavior characteristics, despite having limited or no touch with them as they were adopted as babies.

“The really exciting take-home message from this study is that small, day-to-day positive interactions (互动) that parents have with their young children can make a huge difference in children’s development,’’ said Leslie Leve, a professor at the University of Oregon who co-led the data collection.

“Even when children have inherited (遗传) a very challenging set of behaviors, hearing ‘good job’ or receiving encouragement can help protect them from developing serious problems coming from their inherited difficulties,” he added. The study, worked on by scientists from the University of Michigan, Penn State University and the University of Oregon has been published in the American Journal of Psychiatry. Researchers will follow the group of children through early adolescence to determine if these behaviors still continue to exist from the toddler years.

1.What’s the main idea of the passage?

A. Kids’ social behaviors are related to crime.

B. Criminals begin their crimes during adolescence.

C. Antisocial behaviors of kids could be on their way to a life of crime.

D. Warmhearted kids are more likely to be criminals in the future.

2.What conclusion might the scientists draw from the study?

A. Antisocial behaviors might be inherited.

B. The genes decide kids’ antisocial behaviors.

C. Antisocial behaviors have noting to do with crimes.

D. Adopted babies surely have antisocial behaviors when they grow up.

3.What can be inferred from the passage?

A. Parenting is the main reason that causes kids’ antisocial behaviors.

B. What causes career criminals to begin their crimes is their parents’ characteristics.

C. Leslie Leve has a doubtful attitude to adoptive mothers’ active interactions with kids.

D. Inherited antisocial behaviors of kids can be lightened by positive parenting.

4.Why will researchers track kids’ process of growing?

A. To make sure if kids’ behaviors will last.

B. To make sure if praise will change kids.

C. To determine if kids’ behaviors will be inherited.

D. To determine if parents’ comfort will protect kids.