单项选择题

Their factory has developed a kind of ______to help people walk.

A． the machine
B． machines
C． machine
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单项选择题
I went shopping yesterday and bought some ______.
A． tomatoes
B． potatos
C． meats
单项选择题
-- Talking about sports, what do you like -- I think I like______.
A． football
B． a football
C． the football
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