Indeed, there have been times when wolves have been seen one moment howling in a chorus, and the next, quarreling among each other.It appears that usually the lowest­ranking members of the pack may actually be“punished” for joining in the chorus at times.

　　So is howling a way to strengthen a social bond or just a way to reconfirm status among its members？—Why do wolves howl for sure?

　　What is clear, however, is that howling is often used among packmates to locate each other. Hunting grounds are distant and it happens that wolves may separate from one another at times. When this happens, howling appears to be an excellent means of gathering.

　　...

　　Q：Researchers are sure that wolves often howl to ________.

　　A．show their ranks

　　B．find their companions

　　C．report the missing ones

　　D．express their loneliness

　　[错解]　C

　　[错因分析]　考生在解答本题时，如果没有注意到题干中的关键词“sure”，很容易误选A、C、D项。其实，只要把握住了题干中的“sure”，再回到文章中寻找相关信息，就很容易确定答案了。

　　[答案]　B　题干中的关键词为“sure”，快速回读原文可以在选文部分的第三段中找到“What is clear，however，is that howling is often used among packmates to locate each other.”，由此可知，很确定的是，很多情况下狼嚎是为了寻找伙伴。

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