【简答题】A.Cries of birds are affected by seasons. B.Only some sorts of birds can cry. C.Birds would cry when they meet ers. D.It is easy to tell the singing of a bird from its crying.
【简答题】阅读理解。 Birds Journeys The wish that shows birds to begin their journeys, and the highly exact feeling of direction shown by traveling birds, stay among the most puzzling mysteries of science. The Arcti...