【单选题】听力原文:Migratory birds use several ways to help them navigate. While traveling on a clear night they use the stars as guides. On cloudy nights, they may be using the earth's magnetic field or the wind t...
【单选题】During daylight hours, birds ______.
D.
are more likely to get lost
【单选题】Most birds find it safe to sleep in the trees, but they have eggs or young chicks, they don't use a nest. [ ]
【单选题】—How do people do bird-watching? —Sometimes they______the birds quietly, sometimes they use telescopes.