The first true piece of sports equipment that man invented was t

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. The Egyptians thought that ball playing was__.
A、childish
B、difficult
C、not enjoyable
D、worthwhile
【正确答案】：D
【题目解析】：从文本中可以分析出，古埃及人尽管好战，但他们仍然有时间进行和平的游戏，并且不久就发展出了多种球类游戏，每种游戏都有自己的规则。这表明他们不仅将球类游戏视为娱乐，而且认为它有其教育价值。特别是文本中提到“Ball playing was thought of mainly as a way to teach young men the speed and skill they would need for war”，即球类游戏主要是被视为教导年轻人战争所需的速度和技能的方式。 因此，可以推断出古埃及人认为球类游戏是有价值的（worthwhile）。选项A（childish）意味着“幼稚的”，这与文中描述的古埃及成年人也参与球类游戏的事实不符。选项B（difficult）意为“困难的”，而文中并未提及球类游戏很困难。选项C（not enjoyable）表示“不愉快的”，但文中提到他们有时间进行和平的游戏，并发展出多种球类游戏，这表明球类游戏对他们来说是愉快的。 综上所述，正确答案是D（worthwhile），即古埃及人认为球类游戏是有价值的。