单项选择题

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
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单项选择题
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
单项选择题
The first balls were probably made of______.
A．animal skins stuffed with rocks
B．twists of hay
C．hides(兽皮) stuffed with hat or feathers
D．grass and leaves tied with vines
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