单项选择题

A．In a street.
B．At the doctor’s.
C．At home.
D．At the office.
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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 hay or feathers
D．grass and leaves tied with vines
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