根据以下资料，回答48~51题。
The first true piece of sports equipment that man invented was the ball.
In ancient Egypt, as everywhere, pitching stones was a favorite children's game.But a badly thrown rock could hurt a child.Looking for something less dangerous to throw, the Egyptians made what were probably the first balls.
At first, balls were made of grass or leaves held together by vines.Later they were made of piece of animal skin sewed together and stuffed with feathers or hay.
Even though the Egyptians were warlike, they found time for peaceful games.Before long they had developed a number of ball games, each with its own set of rules.Perhaps they played ball more for instruction than for fun.Ball playing was thought of mainly as a way to teach young men the speed and skill they would need for war.
第48题 The ball was probably invented because __.
A.throwing stones often caused injuries
B.throwing stones was not fun
C.games with stones did not have rules
D.rocks were too heavy to throw
【正确答案】：A
试题解析：参见第二段。
第49题 This selection says that the Egyptians played __.
A.many different games with balls
B.many different kinds of games
C.only one ball game
D.different games with similar roles
【正确答案】：A
试题解析：参见第四段第二句。
第50题 The Egyptians thought that ball playing was __.
A.childish
B.difficult
C.not enjoyable
D.worthwhile
【正确答案】：D
试题解析：参见第四段最后一句。
第51题 The best title for this selection is __.
A.The First Ball Games
B.How Egyptian Children Played Games
C.Egyptian Sports
D.The Beginning of Sports
【正确答案】：A
试题解析：本文主题明确，讲的是最初的球类游戏。
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