The Wolf and the Crane（在线收听）

    A wolf was eating his supper one day when a bone stuck in his throat．Choking and coughing，he howled about the countryside asking every animal he met to help him．“There's a good reward for anyone who can save me，”he spluttered．A crane heard about this promise and offered to help．“Open your mouth wide，wolf，”she said，and poked her long beak deep into his throat．” Here is the bone that has been troubling you，“she added politely as soon as her head was out of the wolf's mouth“I trust you will now be able to give me the reward you promised．”
    “Reward，”laughed the wolf，showing all his gleaming teeth in a mean smile and quite forgetting his sore throat．”You are lucky I didn't snap your head off with one bite ．That should be enough of a reward for you，ungrateful bird．And it is certainly all you will get from me．”
    If you only help people because you can get something out of it for yourself，you'll be disappointed．Exercises：
    回答下列问题：
    ① What was the wolf doing one day when a bone struck in his throat？
    ② Who heard about the promise and offered to help？