5. What problem has man faced since the use of

　　antibiotics as medicine according to the passage?

　　A. Antibiotics are very difficult to purify.

　　B. Antibiotics do harm to human health.

　　C. Antibiotics resemble some disease­causing bacteria.

　　D. Antibiotics are becoming ineffective in fighting against bacteria.

　　6. Why are Cano's findings considered as a breakthrough in science?

　　A. His discoveries will help revive ancient microbes.

　　B. His discoveries will put an end to the rise of drug­resistant bacteria.

　　C. The

　　company

　　Ambergene

　　has

　　applied

　　the prehistoric antibiotics to drugs.

　　D. The prehistoric antibiotics proved more deadly against drug­resistant modern bacteria.

　　7. According to the last paragraph, what is Stuart Levy's

　　attitude

　　towards

　　the

　　use

　　of

　　ancient antibiotics ?

　　A. Cautious.

　　B. Contradictory.

　　C. Confident.

　　D. Critical.

　　8. Which of the following can be the best title for the

　　passage?

　　A. Antibiotics－Dangerous or Not?

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