C. naturally

　　D. accidentally Because it is unfamiliar, health workers may not

　　4

　　it, and may not take any measures to stop it from

　　5

　　. People with the disease may continue to have

　　6

　　with others. In this way, the germs travel from person to person through the population. 4. A. protect

　　B. stop

　　C. permit

　　D. identify 5. A. changing

　　B. dying

　　C. spreading

　　D. growing 6. A. trade

　　B. contact

　　C. fun

　　D. communication

　　Heating and cooling systems can also be a

　　7

　　of disease. They tend to collect dirt and water, which creates the perfect

　　8

　　for germs to grow. Then when the air conditioner is turned on, the germs are blown into the home or office and make people sick. This

　　9

　　was first recognized by scientists in July 1976. 7. A. form

　　B. source

　　C. result

　　D. phenomenon 8. A. plant

　　B. air

　　C. environment

　　D. temperature 9. A. office

　　B. bacterium

　　C. conditioner

　　D. problem

　　Pollution of the

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