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单项选择题

A.Ozone is an extremely inactive gas.
B.Ozone only exists in the upper atmosphere.
C.Ground-level ozone is closely related to people's health.
D.Children breathe more air per pound of body weight than adults.

    A.Ozone
    B.
    B.Ozone
    C.
    C.Ground-level
    D.
    D.Children
    E.
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