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
【参考答案】1-4 DCBD
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