To test his theory , Choe and his team put different chemicals on ants. When the scientists used the “I'm dead” chemical, other ants quickly moved the treated ant away. When the scientists used the “Wait—I'm not dead yet” chemical, other ants left the treated ant alone. Choe believes this behavior shows that the “not dead yet” chemical overrides the “dead” chemical when picked up by other ants. And that when an ant dies, the “not dead yet” chemical fades away. Other nearby ants then detect the remaining “dead” chemical and remove the body from the nest.

　　Understanding this behavior can help scientists figure out how to stop ants from invading new places and causing problems.

　　59. What is the function of the first paragraph?

　　A. Leading the following paragraphs.

　　B. Showing the main idea of the passage.

　　C. Introducing the background of the passage.

　　D. Giving a summary of the passage.

　　60. Which of the following has the closest meaning to the underlined word “overrides” in the fourth paragraph?

　　A. is weaker than

　　B. is stronger than

　　C. is better than

　　D. is worse than

　　61. What can we learn from the passage?

　　A. Living ants can also be taken away when they are not moving.

　　B. When an ant dies, it can tell others using a certain chemical.

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