The Boys and the Frogs（在线收听）

    A troop of boys were playing at the edge of a pond，when，perceiving a number of frogs in the water，they began to pelt at them with stones They had already hilled many of the poor creatures，when a frog that is more hardy than the rest putting his head above the water，cried out to them，“Stop your cruel sport，my lads；consider，what is play to you is death to us．”
    Exercises：
    判断对（T）、错（F）：
    ① A troop of boys were pelting at a number of frogs in the water at the edge of a pond．② They only killed few of the poor creatures．③ All the frogs dare not say anything．回答下列问题：
    ① What were the boys doing at the edge of a pond？
    ② What did the frog cry out to the boys？