The Wild Apple-Tree（在线收听）

    A swarm of bees settled and built hive in the hollow trunk of a wild apple－tree．They soon filled it with the treasures of honey，andthe tree became so proud in consequence，that it despised all its neighbours．Hereupon a rose－bush thus addressed it：“Miserable pride on ac-count of borrowed sweetness！Does your fruit，therefore，become less bitter？Sweeten it with your honey if you can；for only then will you be prized by mankind！”
    Exercises：
    回答下列问题：
    ① What did the swarm of bees do？
    ② Why did the wild apple-tree become so proud？
    ③ What did the rose-bush mean by saying that？