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1. The case of Ashanthi Desilva is mentioned in the text to _______。
[ A ] show the promise of gene-therapy
[ B ] give an example of modem treatment for fatal diseases
[ C ] introduce the achievement of Anderson and his team
[ D ] explain how gene-based treatment works
2. Anderson’s early success has_______。
[ A ] greatly speeded the development of medicine
[ B ] brought no immediate progress in the research of gene-therapy
[ C ] promised a cure to every disease
[ D ] made him a national hero
3. Which of the following is true according to the text?
[ A ] Ashanthi needs to receive gene-therapy treatment constantly.
[ B ] Despite the huge funding, gene researches have shown few promises.
[ C ] Therapeutic genes are carried by harmless viruses.
[ D ] Gene-doping is encouraged by world agencies to help athletes get better scores.
4. The word “tarnish” (line 4, paragraph 4) most probably means _______。
[ A ] affect
[ B ] warn
[ C ] trouble
[ D ] stain
5. From the text we can see that the author seems _______。
[ A ] optimistic
[ B ] pessimistic
[ C ] troubled
[ D ] uncertain
