[单项选择]

C
One of the greatest killers in the Western world is heart disease. The death rate (率) from the disease has been increasing at an alarming Speed for the past thirty years. Medical experts know that people can reduce their chances of getting heart disease by exercising regulary, by not smoking, by changing their diets, and by paying more attention to reducing stress (压力) in their work.
However, Western health-care systems are still not paying enough attention to the prevention of the disease. There is a need for more programs to educate the public about the causes and prevention of heart disease. In stead of supporting such programs, however, the U. S. health-care system is spending large sums of money on the surgical (外科的) treatment of the disease, after it develops. This emhasis (强调) on treatment clearly has something to do with the technological advances that have taken in the past ten to fifteen years. In this time, modern technology, has enabled doctor
A. more money should be spent on the prevention of heart disease
B. heart surgery has helped most patients improve their conditions
C. modern technology has made heart surgery more risky than before
D. the public have known a great deal about the causes of heart disease