traditional treatments and the other half were given interferon. Among those treated with interferon 70 percent of them remained alive over three years, as compared with only 10 to 30 percent among those who had received the traditional treatments.

　　In the United States, a large-scale project supported by the American Cancer Society is now under way. If the experiment were successful, interferon could become one of the greatest medical discoveries of our time.

　　5.What is the difference between antibiotics and interferon?

　　A. Interferon has serious side effects, while antibiotics do not.

　　B. Antibiotics kill germs by attacking them directly, while interferon does not.

　　C. Antibiotics are very effective, while the effect of interferon is limited.

　　D. They are different in structure, although they are both proteins.

　　6. According to the passage, if 170 cancer patients received interferon treatment, how many of them would remain alive over three years?

　　A. About 30.

　　B. About 50.

　　C. About 120.

　　D. About 70.

　　7. The passage tells us that ________.

　　A. it is difficult to produce interferon in large quantities because of its special structure.

　　B. interferon is produced widely in lots of countries.

　　C. few of the patients who had received traditional treatments remained alive.

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