Questions 29 to 31 are based on the passage you have just heard。
29. Which statement is true according to the passage?
30. According to the passage, why have security alarm system been expensive for many years?
31. Whats the main idea of this passage?
Passage Three
Around the world more and more people are taking part in dangerous sports and activities. Of course, there have been people who have looked for adventure---those who have climbed the highest mountains, explored unknown parts of the world or sailed in small boats across the greatest oceans. Now, however, there are people who seek an immediate thrill from a risky activity which may only last a few minutes or even seconds。
I would consider bungee jumping to be a good example of such an activity. You jump from a high place 200 meters above the ground with an elastic rope tied to your ankles. You fall at up to 150 kilometers an hour until the rope stops you from hitting the ground. It is estimated that 2 million people around the world have now tried bungee jumping. Why do people take part in such activities as these? Some psychologists suggest that it is because life in modern societies has become safe and boring. Not very long ago, peoples lives were constantly under threat. They had to go out and hunt for food, diseases could not easily be cured, and life was a continuous battle for survival。
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