[单项选择]While disease is present prior to social organization, communal life creates special hazards. While the organization of society can reduce the dangers of disease, trade and urbanization, with their consequent problems of sanitation and pollution, can also aggravate such dangers. Even in the mid-twentieth century, during the brief calm between the polio and AIDS epidemics, epidemic health risks associated with carcinogens (cancer-producing substances ) from polluted air threatened the industrialized world. 　　To the economist, efforts to combat these risks are at least partially public goods. The benefits from public goods are indivisible among beneficiaries. A sole private purchaser of health care would give others in society a "free ride" with respect to the benefits obtained. To market theorists, such goods are lawful objects of governmental intervention in the market. While the theory of public goods helps explain aspects of public health law and assists in fitting it into modern ec
A. the indivisibility of its benefits among its receivers.
B. the impact of societal factors on the individual’’s health.
C. the government obligation to provide health care for its people.
D. the comprehension of disease within a particular cultural context.

[单项选择]While disease is present prior to social organization, communal life creates special hazards. While the organization of society can reduce the dangers of disease, trade and urbanization, with their consequent problems of sanitation and pollution, can also aggravate such dangers. Even in the mid-twentieth century, during the brief calm between the polio and AIDS epidemics, epidemic health risks associated with carcinogens (cancer-producing substances ) from polluted air threatened the industrialized world. 　　To the economist, efforts to combat these risks are at least partially public goods. The benefits from public goods are indivisible among beneficiaries. A sole private purchaser of health care would give others in society a "free ride" with respect to the benefits obtained. To market theorists, such goods are lawful objects of governmental intervention in the market. While the theory of public goods helps explain aspects of public health law and assists in fitting it into modern ec
A. comment on the government role in health-care provision.
B. argue about the social organization’’s tasks concerning health care.
C. trace the historical development of the national health-care system.
D. discuss the societal duty to make provision against epidemic diseases.