单项选择题

You don't have to install this radio in your new car. It's an______extr

A． excessiveB. optionalC. additionalD. arbitrary
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单项选择题
In previous times, when fresh meat was in short______, pigeons were kept by many households as a source of food.
A．store
B．provision
C．reserve
D．supply
单项选择题
As we are on the point of______some important business with them, we should like to know exactly about their credit standing.
A．transmitting
B．transferring
C．transacting
D．transporting
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