___________

A．Receiving radio signals from electronic tracking devices.

B．Being contacted by people who recapture banded birds.

C．Counting the birds that return to the same region every year.

D．Comparing old and young birds' migration routes.

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参考答案

答案解析

【预测】选项均为动名词短语，结合其中重复出现的birds，以及radio signals，recapture，return to the same region和migration routes可知，本题可能考查某种行为方式，可能与获取鸟类信息有关。
【解析】B。录音中教授提到通过绑带来研究蜂鸟(running a banding study)，这种绑带上标有一个追踪码和人们可以免费拔打的电话号码，当有人抓到被绑定的蜂鸟并告知其情况时，我们就可以知道它们的迁徙路线、成长情况等，故答案为B。

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