题目

Long，long ago，a man went to his neighbor's house and tried to steal something. On entering the gate，he saw there ________a big bell. The bell was beautiful in ____________and shape. The thief was very glad，and________to carry this beautiful bell back home. But no matter how hard he tried，he could not _________the bell，because the bell was both big and _________. He thought and thought，and _________there was only one way to solve the problem. He had to_________ the bell to pieces before he was able to carry them back to his home___________The thief found a big iron hammer，with w引起侏儒症的病因是（ ）A．幼年时期甲状腺功能不足B．甲状腺功能亢进C．胰岛素分泌不足D．幼年时期生长激素分泌过少