The Dog and the Bone（在线收听）

    A dog once stole a bone from a butcher's shop．He ran off down the street as fast as he could，across the meadow in the village and down the hill to a rough bridge over a stream．There he paused，panting，to look at the clear，clean water．What he saw gave him a start Looking up at him from the water was another dog The other dog was holding a big juicy bone in its mouth．This dog glared at that dog and that dog glared fiercely back at him．This dog's mouth began to water．“If I had that bone，”he thought greedily，“I could eat it now andsave mine for later．I know a right place to bury it．Besides，that bone looks better than mine．It has more meat on it．”
    This dog growled threateningly—and the dog in the water bared its teeth and seemed to growl back at him．“So you want a fight，do you？”growled the dog on the bridge，and he opened his mouth to grab the other dog's bone．Splash！The dog's bone fell into the stream and was swept away by the current．Barking angrily，he leaned forward to attack，but as his bone fell into the water the other dog seemed to vanish away．Its bone vanished with it．As the ripples gradually smoothed away the dog was left feeling rather foolish—and very hungry—staring at his own reflection．Be satisfied with what you have．Exercises：
    回答下列问题：
    ①Where did the dog reach？
    ②What did the dog see from the river？
    ③Why did the dog fight with the other dog in the river？
    ④At last，what happened？