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20xx年大学英语六级考试模拟试题及答案
Passage Two
Questions 29 to 31 are based on the passage you have just heard.
29. A） It limited their supply of food. C） It destroyed many of their nests.
B） It made their eggshells to fragile. D） It killed man baby bald eagles.
30. A） They found ways to speed up the reproduction of bald eagles.
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