单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．One.
B．Three.
C．Two.
D．Four.
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填空题
The second hypothesis concerning the mapping ability of birds proposes an idea that birds may be able to extract latitude and longitude from______.
填空题
German ornithologists proved that birds have a______guiding their navigatory behavior though some biologists argued that it was impossible for birds to sense the weak magnetic force of the Earth.
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