D．cows

　　broke

　　their

　　halters

　　and escaped from their sheds

　　解析：细节理解题。根据第二段中的内容可知在1975年发生在中国的一次地震中，蛇提前从冬眠中苏醒，结果被冻死。

　　答案：C

　　3．Which of the following is one of earthquake nerves according to the passage?

　　A．An Arabian horse tried to escape from his enclosure.

　　B．A cougar had an upset stomach unexpectedly.

　　C．An Australian horse was perfectly calm.

　　D．A cat acted very strangely in a zoo.

　　解析：细节理解题。根据第三段中的“...an Arabian horse became very nervous and tried to break out of his enclosure.”可判断A项正确。

　　答案：A

　　4．The scientists did an experiment with a group of dogs to ________.

　　A．find out that the machine could record unusual happenings

　　B．compare the reactions of animals and those of humans

　　C．prove that animals could sense more than humans

　　D．find out what exact warnings animals send

　　解析：推理判断题。第四段中提到动物的感觉比人类更敏锐，下文则用狗的实验进行例证，由此可推断C项正确。

　　答案：C

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