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

　　【参考答案】1-4 DCBD

　　较难题目特训：介绍说明类

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　According to the US government, wind farms off the Pacific coast could produce 900 gigawatts of electricity every year. Unfortunately, the water there is far too deep for even the tallest windmills (see picture) to touch bottom. An experiment under way off the coast of Norway, however, could help put them anywhere.

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