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A. by ourselvesB. in a prolonged battle
C. to kill all the immune cells in a health individualD. to be stronger
17. According to the author, the degree of sickness after infection and the rate of recovery mainly depend on
A. how strong your areB. how old you are
C. severe the illness isD. the strength of your immune system
18. How to avoid the infection of SARS? You may follow all the following EXCEPT
A. keeping away from those infected individuals
B. keeping away from those infected area
C. boosting up your immune function
D. keeping extremely healthy all the time
19. Scientists are now working on tracking the treatment
A. detecting all sorts of flaws in DNA
B. fixing all sorts of flaws in DNA
C. treatments that delay the attack of the disease
D. artificial version of the protein
20. Which of the following is the best title of the passage?
A. Genetic engineeringB. Genetic screening
C. A new technologyD. Application of genetic engineering
1. C 2. A 3. C 4. B 5. C 6. D 7. A 8. C 9. D 10. B
11. D 12. C 13. C 14. D 15. C 16. D 17. D 18. D 19. B 20. D
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