单项选择题

Why do milk teeth begin to fall out

A．Because you are too young.
B．Because you are too old.
C．Because their food supply is cut off.
D．Because food supply are cut off.
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单项选择题
What kind of weather was it there
A．Cold and rainy.
B．Cold and windy.
C．Hot and windy.
D．Warm and rainy.
单项选择题
Where will they meet
A．At the railway station.
B．In front of the bus station.
C．On the way to the station.
D．At a shop near the station.
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