Scientists are trying to identify the different genes that influence our behaviour. Some people are thrill-seekers and get into risk-taking and adventurous activities. They take up extreme sports like bungee jumping and possibly take drugs. Scientists have discovered a gene which affects this.

　　We could ask, “Are our lives determined by our genes or our upbringing?” Scientists are learning more all the time, but it is certainly true that both are important in making us who we are.

　　56. What is the main idea of the first paragraph?

　　A. We cannot easily change our physical appearance.

　　B. How we turn out depends on our parents’ genes.

　　C. Everyone has a physical double somewhere in the world.

　　D. Both our genes and our experiences make us who we are.

　　57. Why are scientists studying twins?

　　A. To find out how many twins are born every year.

　　B. To discover what shapes us as individuals.

　　C. To compare differences between twins.

　　D. To study brother-and-sister relationships.

　　58. According to the passage, 　.

　　A. one in 70 twins are genetically identical

　　B. non-identical twins are usually not of the same sex

　　C. twins separated at birth behave exactly the same

　　D. identical twins are genetically the same

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