鲸总要浮上水面呼吸,那他睡觉的时候怎么呼吸?睡觉的时候不呼吸?或者,每隔一小时醒来一次换气?

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• During the past hundred years,the car,the radio.the cinema,and now television,have produced great changes in the amusements with which people pass their __1__time.A__2__years ago,people were in the habit of making their own amusement.When a group of people were gathered toghther,they talked,played cards,or other games,or went out riding,shooting or talking toghther.Most people could sing a little,or__3__some musical instrument.Conversation was an__4__