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All adults at some time or another commit (犯罪) a crime, sometimes by accident, but why do some people intentionally commit crimes? Here are three theories that try to explain the causes of criminal behaviour.

GENETIC (遗传的) CAUSES

The idea that some people commit crimes because of biological causes has a long tradition. This theory suggests that criminals are born, not made. In the 19th century some people even thought brain sizes and skull shapes could explain criminal behaviour. Although experts today no longer believe this, they do argue that human behaviour can be linked to an individual’s genes. Studies of adopted children who show criminal behaviour suggest that their behaviour is more similar to their biological parents behaviour-than their adoptive parents’, showing a genetic link.

ENVIRONMENT

This theory states that a person’s surroundings influence their behaviour. Just as children learn good behaviour from their parents and brothers or sisters, children can learn bad behaviour from their families and other close relationships. Researchers in this area argue that early anti-social (反社会的) behaviour in childhood often leads to a future of criminal behaviour. It is a dangerous circle, as one expert states: “Problem children are likely to grow up into problem adults, and problem adults are likely to produce more problem children.”

CHOICE

The central idea of this theory is that crime is a career decision, an alternative (可选择的) way of making a living. The theory argues that most criminals are sensible people, who know what they want and the different ways of getting it, i.e. work or crime. They are able to balance the risks of committing a crime, such as going to prison, against its benefits, i.e. what they gain if they aren’t caught. The conclusion is: if there are more benefits than risks, do it, but if there are more risks than benefits, don’t do it.

1.What does the second theory conclude?

A.A family determines a child’s future.

B.Relatives play a key role in a person’s crime.

C.Uneducated children tend to become criminals.

D.The environment greatly influences people’s behaviour.

2.According to the text, criminals ________.

A.consider what they can lose and gain in a crime

B.don’t think before they decide on a life of crime

C.tend to believe they can avoid the risks of a crime

D.often achieve their goals through crime instead of work

3.What can be a suitable title for the text?

A.Types of crimes

B.Crimes and punishments

C.Why do people commit crimes?

D.What influences will crimes have?

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