“They swallowed the leaves whole,” explains Wrangham, noting that chimps usually chew their food well. “They seemed to rub（摩擦）the leaves around the roofs of their mouths. They closed their eyes, wrinkled their noses and swallowed slowly. ”

　　Wrangham wondered what could be so good about something tasting so bad. He had a chemist analyze the leaves. He discovered that the leaves contain a red oil that kills different viruses（病毒）. Later tests showed that the oil might even fight cancer and the AIDS virus!

　　Why don’t the chimps chew the leaves? “Rubbing the leaves between the tongue and the inside of the mouth might allow the chemicals to enter the bloodstream directly,” he suggests, “instead of going to the stomach, where they might get destroyed by acids. The chimps seem to know what they’re doing.”

　　67. We can learn from the passage that _________.

　　A. chemicals in plants help cure animals

　　B. chimps cure themselves by chewing plants

　　C. scientists live with chimps to study their diets

　　D. Dr. Wrangham knows a lot about forest plants

　　68. How can Dr. Wrangham tell which plants are medicine for chimps?

　　A. By talking with the biologists.

　　B. By analyzing the chimps’ favorite food.

　　C. By studying the chimps’ feeding habits.

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