C. It stands quietly

　　D. It sends out certain chemicals.

　　25. What does the author mean by “the tables are turned” in paragraph 3?

　　A. The attackers get attacked.

　　B. The insects gather under the table.

　　C. The plants get ready to fight back.

　　D. The perfumes attract natural enemies.

　　26.Scientists find from their studies that plants can

　　.

　　A.predict natural disasters

　　B.protect themselves against insects

　　C.talk to one another intentionally

　　D.help their neighbors when necessary

　　27.what can we infer from the last paragraph?

　　A.The word is changing faster than ever.

　　B.People have stronger senses than before

　　C.The world is more complex than it seems

　　D.People in Darwin’s time were more imaginative.

　　C

　　After years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.

　　Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.

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