The Crane，the Crow and the Countryman（在线收听）

    A crane and a crow made a league on oath，providing that the crane should protect the crow against other birds，and that the crow should foretell the future，so that the crane could be on her guard．After this，they flew as usual into the fields of a certain countryman and pulled out wholely what had been sown．The owner of the fields saw it，and being vexed，cried out：“Give me a stone，boy，so that I may hit the crane．”When the crow heard this，she warned the crane at once，who took all due precautions．On another day，the crow，having heard him ask for a stone，a-gain warned the crane carefully to avoid the danger．The countryman，suspecting that the divine bird heard his commands，said to the boy，“If I say，give me a cake，you secretly hand me a stone．”The crane came again；he bade the boy give him a cake，then the boy gave him a stone，with which he hit the crane，and broke her legs．The crane，on being wounded said：“Prophetic crow，where now are your auspices！Why did you not hasten to warn your companion，as you swore you would，so that no such evil might befall me？”The crow answered：“It is not my art that deserves to be blamed；but the behaviour of those double-tongued people are so deceitful who say one thing and do another．”
    Exercises：
    回答下列问题：
    ①What was the oath between a crane and a crow？
    ②What did they often do？
    ③What did the farmer say to his child？
    ④Was the crane wounded？What can we learn from this fable？