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Questions 14 to 16 are based on the following passage you have just heard. You have 15 seconds to read Questions 14—16. What was the main harmful effect of the pest’s killer DDT on bald eagles

A．It limited their supply of food.
B．It destroyed many of their nests killed
C．It many baby bald eagles.
D．It made their eggshells too fragile.

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单项选择题

Questions 14 to 16 are based on the following passage you have just heard. You have 15 seconds to read Questions 14—16. What was the main harmful effect of the pest’s killer DDT on bald eagles 您的浏览器不支持 audio 元素。