In this case there was a machine to monitor what the dogs were sensing. Many times, however, our machines record nothing extraordinary, even though animals know a quake is coming. The animals might be sensing something we measure but do not recognize as a warning.Discovering what animals sense, and learning how they know it is a danger signal, is a job for future scientists.

　　语篇解读：利用动物进行地震前的预测不失为一种好方法，种种事实表明，动物在地震之前往往先知先觉，它们的异常表现也许就是地震的征兆。

　　1．Through the passage the writer hopes to explore ________.

　　A．why animals send a danger signal before an earthquake

　　B．how animals know when an earthquake is coming

　　C．why animals not humans have a good sense of danger

　　D．how much animals know about an earthquake

　　解析：作者意图题。文章开门见山地指出科学家们找到了预测地震的帮手——动物，下文则详细分析了动物在地震前的异常反应，再结合最后一段中的内容可知作者希望探寻动物如何知道地震将要发生。

　　答案：B

　　2．During an earthquake in China in 1975 ________.

　　A．chickens refused to go out of their cage

　　B．snakes were frozen to death in their caves

　　C．snakes awoke from their winter sleep earlier

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