听力原文： What is your favorite color? If you like yellow, orange or red, you must be an optimist, an active person who enjoys life, people and excitement. If you prefer gray and blue, then you're probably quiet, shy, and you would rather follow than lead. You tend to be a pessimist. At least, this is what psychologists tell us, and they should know because they have been seriously studying the meaning of color preferences as well as the effects that colors have on human beings. They tell us, among other facts, that we do not choose our favorite color as we grow up since we were born with our favorite. If you happen to love brown, you did so, as soon as you opened your eyes, or at least as soon as you could see clearly. Colors do influence our moods. Light and bright colors make people happier and more energetic. A black bridge over the Thames River, near London, used to be the scene of more suicides than any other bridge in the area until it was repainted green. The number of suicide immediately fell sharply. Perhaps it would have fallen even more if the bridge had been clone in pink or baby blue. It's an established fact that factory workers work better, harder and have fewer accidents when their machines are painted orange rather than black or gray. What is the passage going to tell us?