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    Alzheimer's disease is a major national health problem. Nearly 2 million Americans over the age of 65 have Alzheimer's disease. It is a leading cause of death among the elderly. But Alzheimer's disease is not confined (限于) to the aged. There may be a million or more people under the age of 65 suffering from the disease.

    At one time, people suffering from the disease were said to be "getting old". The disease was thought to be a natural part of growing old, but it is now known that Alzheimer's disease strikes young and old alike. It is an organic(器官的) disease that destroys brain cells.

    Alzheimer's disease affects the patient's memory, speech, and movement. In the beginning stages of the disease, the patient may seem slightly confused. He may have trouble speaking. Then the patient's memory begins to fail. He may forget dates, telephone numbers, names and plans.

    As the disease progresses, the patient may not recognize family and friends. These symptoms(症状) often cause terrible anxiety in the patient. He may feel lost and frightened. Sometimes the patient reacts with wild and bad behavior.

    In the last stages of the disease, the patient may not be able to take care of himself. He may have lost the ability to speak and walk.

    Some of the scientists think a virus causes Alzheimer's disease. At present, there is no cure for the disease. But there are ways to slow its progress. Exercise and physical treatment can help the patients of this disease.

    50. Alzheimer's disease ____________.

    A. a terrible part of the aging process                 B. is an organic disease that affects young and old

    C. can be cured by physical treatment                D. causes high fever

    51. All of the following are symptoms of Alzheimer's disease EXCEPT ____________.

     A. brain damage   B. difficulty in speaking     C. loss of sight     D. loss of the ability to walk

    52. According to the passage, which of the following may be a cause of Alzheimer's disease?

    A. Poisons produced by the brain.        B. Getting old.    C. A virus.        D. Lack of exercise.

    50-52 BCC

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