单项选择题

A．It’s $14.99.
B．It’s $40.99.
C．It’s $14.19.
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单项选择题
It is not widely known that______.
A．air is important to human being
B．air is important to the earth
C．air is necessary in many other ways
D．air is necessary to the animals
单项选择题
The existence of electricity in the air has been known ______.
A．for hundreds .of years
B．for several years
C．recently
D．for thousands of years
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