摘要：II. 用被动语态改写下面的短文. In the course of history, people have sent messages in many different ways. Once upon a time, Native Americans used smoke signals to send messages from one camp to another. People also used drums, both in Africa and America, to send news and to announce gatherings. Sailors wrote messages, put them in bottles and threw them into the sea. People have used certain types of birds to send messages, especially in wartime. In 1994 the Swiss army made a decision to give up its collection of message-carrying birds.

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