[单项选择]Smallpox was the first widespread disease to be eliminated by human intervention. A highly contagious viral disease, it was endemic in Europe, causing the death of millions of people until the development of vaccination by Edward Jenner around 1800. In many non-European nations, it remained a dreaded, often fatal illness until very recently.
In May 1966, the World Health organization (WHO), an agency of the United Nations, was authorized to initiate a global campaign to eradicate smallpox The goal was to eliminate the disease in one decade. At the time, the disease posed a serious threat to people in thirty nations. More than 700 physicians, nurses, scientists, and other personnel from WHO joined about 200,000 health workers in the infected nations to battle the disease. Because similar projects for malaria and yellow fever had failed, few believed that smallpox could actually be eradicated, but eleven years after the initial organization of the campaign, no cases were reported in
A. Vaccinations of entire villages.
B. Treatment of individual victims.
C. Isolation of victims and mass vaccinations,
D. Extensive reporting of outbreaks.

[填空题]Hearing loss is the most widespread disease in the United States.

[单项选择]Passage One Parkinson’s disease, first described in the early 1800s by British physician James Parkinson as "shaking palsy", is among the most prevalent neurological disorders. According to the United Nations, at least four million people worldwide have it; in North America, estimates run from 500,000 to one million, with about 50,000 diagnosed every year. These figures are expected to double by 2040 as the world’s elderly population grows; indeed, Parkinson’s and other neurodegenerative illnesses common in the elderly (such as Alzheimer’s and amyotrophic lateral sclerosis) are on their way to overtaking cancer as a leading cause of death. But the disease is not entirely one of the aged: 50 percent of patients acquire it after age 60; the other half are affected before then. Furthermore, better diagnosis has made experts increasingly aware that the disorder can attack those younger than 40. So far researchers and clinicians have found no way to slow, stop or prevent
A. The dopaminergic nerve cells are impaired by the victim cells.
B. The dopaminergic nerve cells can no longer co-ordinate movement.
C. There are tumors in the brain.
D. There are not enough dopaminergic neurons in the brain.