TOEFL Reading: ETS-TOEFL阅读机经 - C675K1E_F8NZ3830L$

According to paragraph 4, which of the following best describes the second epidemiological transition? A. Modern medicine made it possible for people to live longer even if they had an infectious disease. B. Infectious diseases were harder to cure due to factors like stress and pollution. C. New infectious diseases appeared as quickly as modern medical science was able to control old ones. D. Chronic diseases replaced infectious diseases as the major cause of human sickness and death.