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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 measure did the wild life biologists take to increase the number of bald eagles

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

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单项选择题

A．sourceB．originC．resourceD．base

A．source
B．origin
C．resource
D．base

单项选择题

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.

Questions 14 to 16 are based on the following passage you have just heard. You have 15 seconds to read Questions 14—16. What measure did the wild life biologists take to increase the number of bald eagles 您的浏览器不支持 audio 元素。

Questions 14 to 16 are based on the following passage you have just heard. You have 15 seconds to read Questions 14—16. What measure did the wild life biologists take to increase the number of bald eagles