单项选择题

This passage tells us something about ______.

A．how large Australia is
B．why the radio is important in Australia
C．how the radio is used in Australia
D．both B and C
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单项选择题
Families on the large farms kept in touch with each other by ______.
A．radio
B．a newspaper
C．a bird
D．both B and C
单项选择题
It flies aero planes to towns and cities in Asia ______.
A．at all time of the day and night
B．at all time right through the week
C．two or three times a week
D．day and night fight through the week
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