听力题 Bows and arrows are one of man''s oldest weapons. They gave early man an effective weapon to kill his enemies. The ordinary bow, or Short Bow, was used by nearly all early people. This bow had limited power and a short range. However, man overcame there faults by learning to track his target at close range. The Long Bow was most likely discovered when someone found out that a five-foot piece of wood made a better bow than a three-foot piece. Hundreds of thousands of these bows were made and used for three hundred years. However, not one is known to survive today. We believe that a force of about one hundred pounds was needed to pull the string all the way back on a Long Bow. For a long time, the bow was just a bent stick and a string. In fact, more changes have taken place in a bow in the past twenty-five years than in the last seven centuries. Today''s bow is forceful. It is as exact as a gun. In addition, it requires little strength to draw the string. Modern bows also have precise aiming devices. In indoor contests, perfect scores from forty yards are common. The invention of the bow itself ranks with the discovery of fire and of the wheel. It was a great step forward for man.