A、Because many people don’t know how to behave in social situation. B、Because most people are shy by nature. C、Nobody will laugh

Are you afraid of raising your hand in class even when you know the answer? Are you fond of staying at home instead of joining in a party when invited? If you are, most people would say that you are shy. If you feel shy, you are not alone. Nine out of ten people are at least a little shy. However shy you are though, scientific evidence seems to show that it isn’t your fault. You may have been born that way. How do psychologists measure shyness? One way is by observation. They keep detailed records of people’s actions, like how often these people speak to others or how long it takes someone to say “hello” to a stranger. Another way to measure shyness is to ask people questions. The test only takes about 10 minutes. It asks questions like: “Do you have many friends?” “Do you feel relaxed in group activities?” or “If you lose your way, will you ask other people for directions?” People must answer either yes or no. These questions can predict how people actually behave in social situations. Suppose the test tells you that someone is shy, chances are good that person will act shyly. When scientists measure shyness, they are really comparing degrees of shyness. In other words, when researchers say people are shy, they really mean that they are shyer than others.
Questions 30 to 32 are based on the passage you have just heard.
30. Why does the speaker say that it isn’t a fault to be shy?
31. What is one of the ways suggested by psychologists for measuring shyness?
32. What is the purpose of the psychologists in asking questions?