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问题 名词解释

药物依赖性头痛

答案

参考答案：

药物依赖性头痛指某些药物慢性应用或长期应用后，戒断时所引起的头痛。其诊断标准要求每日服用这种药物至少3个月，头痛应在停药后48小时内发生，再次服用这种药物后头痛减轻或消失。导致戒断性头痛的常见药物包括咖啡因、麦角胺、麻醉性止痛药等。

单项选择题

设a=6，则执行x=IIf(a＞5，-1，0)后，x的值为( )。

A．5

B．6

C．0

D．-1
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问答题

People today all over the world are beginning to hear and learn more and more about the problem of pollution. (46) Pollution is caused by either the release by man of completely new and often artificial substances into the environment, or by releasing greatly increased amounts of a natural substance, such as oil from oil tankers into the sea.
(47)The whole industrial process which makes many of the goods and machines we need and use in our daily lives, is bound to create a number of waste products which upset the environmental balance, or the ecological balance as it is also known. (48) Many of these waste products can be prevented or disposed of sensibly, but clearly while more and more new goods are produced and made complex, there will be new, dangerous wastes to be disposed of, for example, the waste products from nuclear power stations.
(49)Whatever its underlying reasons, there is no doubt that much of the pollution caused could be controlled if only companies, individuals and governments would make more efforts. In the home there is an obvious need to control litter and waste. Food comes wrapped up three or four times in packages that all have to be disposed of; drinks are increasingly sold in bottles or tins which cannot be reused. This not only causes a litter problem, but also is a great waste of resources, in terms of glass, metals and paper. Advertising helped this process by persuading many of us not only to buy things we neither want nor need, but also to throw away much of what we do buy. (50)Pollution and waste combine to be a problem every one can help to solve by cutting out unnecessary buying, excess consumption and careless disposal of the products we use in our daily lives.
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