题目内容：
根据以下材料，回答题Passage One
Such chronic ( 慢性的) diseases as heart disease, stroke, cancer,diabetes and lung disorders are the leading cause of death in the world. Yet health experts say these conditions are often the most preventable.The World Health Organization (WHO)points out chronic diseases lead to about 17 million early deaths each year. The United Nations (UN)agency expects more than 380 million people to die of chronic dis-eases by 2015. About 80 % of the deaths will happen in developing nations.
Chronic diseases now cause two-thirds of all deaths in the Asia-Pacific area. In ten years it could be al-most three-fourths. People are getting sick in their most economically productive years. In fact, chronicdis-eases are killing more middle-aged people in poorer countries than in wealthier ones. The WHO estimates
that chronic diseases will cost China alone more than 500,000 million dollars in the next ten years. That esti-mate represents the costs of medical treatment and lost productivity. Russia and India are also expected to face huge economic losses.
According to a WHO report on the problem, deaths from chronic diseases have increased largely as the result of economic gains in many countries. Infectious and parasitic (寄生的) diseases have until recently been the main killers in Asia and the Pacific but they are no longer the major cause of death in most coun-tries.
As many as 80% of deaths from chronic diseases could be prevented, health officials say. An important tool for governments is to limit the marketing of alcohol and tobacco to young people. Also, more programs are needed to urge healthy eating and more physical activities.
The UN aims to reduce chronic-disease deaths by 2%each year through international action by 2015.That's to say,36 million lives could be saved, including 25 million in Asia and the Pacific.
( ) According to the passage,chronic diseases_______. A．are not very serious
B．will disappear
C．can be kept from happening
D．are all deadly
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