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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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