B. Wolves tend to protect their hunting grounds.
C. Wolves sometimes have quarrels after howling together.
D. Wolves of low rank are encouraged to join in the chorus.
. 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
. “Howling… is a contagious behaviour”(in the last paragraph)means_______.
A. howling is a signal for hunting
B. howling is a way of communication
C. howling often occurs in the morning
D. howling spreads from one to another
DCBD
解析:文章讲的是狼群发出嚎叫的原因,作用和特点。
D 判断推理题。根据第二段It’s almost as if howling together helps the pack stay together. Perhaps something similar to people feeling a sense of involvement with each other when singing a song together.可知。
C
事实细节题。根据第三段and the next, quarreling among each other.可知。
B 事实细节题。 根据第四段What is clear, however, is that howling is often used among packmates to locate each other可知。
D 推理判断题。根据Howling, interestingly, is a contagious behavior. When one wolf starts to howl, very likely others will follow.可知,当一只狼嚎叫的时候,别的狼也会跟随一起嚎叫。
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