仔細(xì)閱讀1?

46 What do velieve about aging? ?

B) They just cannot do anything about?it.

47 How do many scientists view aging?now??

A) It might be prevented and treated.?

48 What does Alex Zhavoronkov think of?"describinq aging as a disease"?

?D) It will motivate doctors and pharmacists to find ways to treat aging.

49 What do we learn about the medical?community??

C)They can contribute to people's?health only to a limited extend.

50 What does Professor Leonard Hayflick?believe??

?A) The human lifespan cannot be prolonged.?