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