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【参考答案】

in改为at。
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单项选择题
A．It’s $14.99.B．It’s $40.99.C．It’s $14.19.
A．It’s $14.99.
B．It’s $40.99.
C．It’s $14.19.
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
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