The early (A) periods of aviation in the United States was marked by (B) exhibition flights made by (C) individual fliers or by (D) teams of performers at county fairs. A.    periods of avia

The early (A) periods of aviation in the United States was marked by (B) exhibition flights made by (C) individual fliers or by (D) teams of performers at county fairs.
A.    periods of aviation
B.    exhibition flights
C.    individual fliers
D.    teams of performers

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Đáp án: A

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