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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单项选择题
The Egyptians thought that ball playing was______.
A．childish
B．difficult
C．not enjoyable
D．worthwhile
单项选择题
Those who criticized information technologies are______.
A．leaders of the organized public opposition to information technologies
B．persons engaged in professional works
C．those who benefit most from information technologies
D．those who benefit least from information technologies
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