单项选择题

A．It is very simple to operate.
B．It does not produce pollution.
C．It costs quite a bit of money to use.
D．It can replace cars in crowded city centers.
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单项选择题
A．ThreeB．Five.C．Seven.D．Fifteen.
A．Three
B．Five.
C．Seven.
D．Fifteen.
填空题
S7. When you are breathing hard and unable to engage in conversation, that means you are ______.
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