試題詳解

29. Based on the passage, what is the underlying reason why modern human activities are contributing to the development of new viruses?
(A) Humans are not developing cures fast enough for existing animal viruses.
(B) Natural environments are becoming less diverse, forcing microbes to find new hosts.
(C) Human expansion and practices are increasing contact with and spread of animal pathogens.
(D) Animals are naturally evolving more dangerous forms of microbes.