Bows and arrows, are one of man's oldest weapons. (1)___________________. The ordinary bow or short bow was used by early all early people. This bow bad limited power and short range. However, (2)___________________. 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 needs to pull the string all the way back on a long bow. (3)____________________. In fact, more changes have taken place in a bow in the past 25 years than in the last 7 centuries. Today, bow is forceful. It is as exact as a gun. In addition, it requires little strength to draw the string. (4)____________________. In indoor contests, perfect scores from 40 yard are common. The invention of the bows itself ranks with discovery of fire and the wheel. It was a great-step-forward for man.
发表于 2011-5-12 14:12
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发表于 2011-5-13 07:23
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