单项选择题

The symptoms of Alzheimer’s disease were long dismissed as normal con sequences of human aging, but in the 1980’s the disease came to be recognized as the most common cause of intellectual deterioration in the elderly and middle-aged. It is characterized by the death of nerve cells in the cerebral cortex--the part of the brain involved in complex functions.
The major debilitating symptoms of Alzheimer’s disease include serious forgetfulness--particularly about recent events--and confusion, At first, the individual experiences only minor and almost imperceptible symptoms that are often attributed to emotional upsets or other physical illnesses. Gradually, however, the person becomes more forgetful, and this may be reported by anxious relatives. The person may neglect to turn off the oven, may misplace things, may recheck to see if a task was done, may take longer to complete a chore that was previously routine, or may repeat already-answered questions. As the disease progresses, memory loss and such changes in personality, mood, and behavior, such as confusion, irritability, restlessness and agitation, are likely to appear. Judgment, concentration, orientation, writing, reading, speech, motor behavior and naming of objects may also be affected. Even when a loving and caring family is available to give support, the victim of Alzheimer’s disease is more likely to spent his or her last days in a nursing home or long-term care institution. At this time, there is no cure.
According to the passage, which of the following causes Alzheimer’s disease

A. Severe emotional stress.
B. Nutritional deficiency.
C. The death of nerve cells in the cerebral cortex.
D. Severe head trauma.
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单项选择题
Americans are now taking steps to solve the problem of alcoholism by ______.A. decreasing the amount of alcohol dnmk by driversB. teaching young students how to drive safely after drinking alcoholC. punishing people more heavily for driving after drinking alcoholD. giving special courses to teach doctors about new drugs and treatments for alcoholics
Alcoholism is a major social problem in countries throughout the world. The United States is no exception. Experts believe that several million Americans are alcoholics today. Their health care needs, car accidents, reduced job performance and other problems cost thousands of millions of dollars every year.
In the early 1900s, many Americans joined in a campaign to make alcohol illegal in the United States. In 1920 an a mendment was added to the Constitution. It made drinking or selling alcohol a crime. But the new law did not stop people from drinking. Criminals produced or imported alcohol illegally and sold it almost everywhere.After a few years Americans realized the so-called Prohibition Law did not work. So in 1933 another constitutional change was made, canceling the amendment that made alcohol illegal.
In recent years Americans have taken other steps to deal with the problem of alcohol. One important action had been to increase the punishment for people who drive their automobiles after drinking alcohol. Many states now consider this to be a serious crime. Another important step has been to explain to children and students the dangers of alcohol. Many schools now offer special programmes to teach young people about the problem. Doctors have been working to develop new drugs and treatment programmes to help alcoholics. Finally, alcoholics themselves are dealing with the problem of alcoholism. Many of them have" gone on the wagon" and stopped drinking. They have joined the Alcoholics Anonymous group meeting regularly to discuss their problems and give each other support. "Going on the wagon" is not the only way to conquer alcoholism, but most alcoholic say it is the best way. They must give up alcohol completely so their own body and spirit can survive.
单项选择题
B