阅读理解：

　　Since we are social beings, the quality of our lives depends in large measure on our interpersonal relationships. One strength of the human condition is our possibility to give and receive support from one another under stressful conditions. Social support makes up of the exchange of resources among people based on their interpersonal ties. Those of us with strong support systems appear better able to deal with major life changes and daily problems. People with strong social ties live longer and have better health than those without such ties. Studies over types of illnesses, from depression to heart disease, show that the presence of social support helps people defend themselves against illness, and the absence of such support makes poor health more likely.

　　59. Interpersonal relationships are important because they can ________

　　C. deal with life changes D. cure types of illnesses

　　A. lies in the social medical care systems which support them

　　C. depends on their ability to deal with daily worries and troubles