If the results hold, then this study is an example of wildlife adaptation to Urhanization--or at least evidence that birds are smart and can still follow their noses in urban environments.

　　5. What may be the function of nicotine in cigarette butts for birds?

　　A. To drive harmful insects away from bird nests.

　　B. To provide building materials for bird nests.

　　C. To protect the plants from being eaten by insects.

　　D. To attract baby birds to stay in the nests.

　　6. What is the first experiment aimed at?

　　A. Proving that heat traps attract harmful insects in Mexico City.

　　B. Comparing smoked cigarette filters with unsmoked ones.

　　C. Analyzing what is produced from smoked cigarette filters.

　　D. Studying what it is that drives harmful insects away.

　　7. What can you infer from the passage?

　　A. Birds tend to use insecticide to protect the baby birds.

　　B. Nicotine is the only chemical that drives harmful insects away.

　　C. Some insects are afraid of smelly chemicals in aromatic plants.

　　D. Unsmoked cigarette traps attract more harmful insects.

　　8. Where could you possibly see the passage?

　　A. In a science report.

　　B. In an urbanization essay.

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