Howling, interestingly, is a contagious behaviour. When one wolf starts to howl, very likely others will follow. This is often seen to occur in the morning, as if wolves were doing some sort of “roll call” where wolves all howl together to report their presence.

　　1. What is the possible similarity between wolves’ howling together and humans’ singing in chorus?

　　A. The act of calling each other.

　　B. The sense of accomplishment.

　　C. The act of hunting for something.

　　D. The sense of belonging to a group.

　　2. Why does Harrington think the “social bond” theory may be wrong?

　　A. Wolves separate from each other after howling.

　　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.

　　3. Researchers are sure that wolves often howl to　.　

　　A. show their ranks

　　B. find their companions

　　C. express their loneliness

　　4. “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

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