The exact mechanisms involved are still mysterious, but the likelihood that many cancers are initiated at the level of genes suggests that we will never prevent all cancers. Changes are a normal part of the evolutionary process, says oncologist William Hayward. Environmental factors can never be totally eliminated; as Hayward points out, We cant prepare a medicine against cosmic rays.
The prospects for cure, though still distant, are brighter.
First, we need to understand how the normal cell controls itself. Second, we have to determine whether there are a limited number of genes in cells which are always responsible for at least part of the trouble. If we can understand how cancer works, we can counteract its action.
63. The example of Pasteur in the passage is used to ________.
[A] predict that the secret of cancer will be disclosed in a decade
[B] indicate that the prospects for curing cancer are bright
[C] prove that cancer will be cured in fifty to sixty years
[D] warn that there is still a long way to go before cancer can be conquered
64. The author implies that by the year 2000, ________.
[A] there will be a drastic rise in the five-year survival rate of skin-cancer patients
[B] 90 percent of the skin-cancer patients today will still be living
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