单项选择题A.They found ways to speed up the reproduction of bald eagles.B.They developed new types of feed for baby bald eagles.C.They explored new ways to hatch baby bald eagles.D.They brought in bald eagles from Canada.
A.They found ways to speed up the reproduction of bald eagles.
B.They developed new types of feed for baby bald eagles.
C.They explored new ways to hatch baby bald eagles.
D.They brought in bald eagles from Canada.