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
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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
单项选择题
People who fly with Bel Air ______.
A．know they will travel a lot
B．get what they want quickly and safely
C．know that everything will be just fight
D．always travel right across the world
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