A. Another mid- survey of bald eagles was published in 1984
B. The lower 48 states of the USA published another survey of bald eagles in 1983
C. The 1984 survey of bald eagles was not as complete as the earlier one
D. The result of the two surveys of bald eagles were contradictory
C
Đáp án C ( line 2 “ an incomplete mid winter one” )
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