判断题：目前，被艾滋病病毒感染的男性远高于女性，主要原因是男性的不安全性行为和吸毒行为高于女

题型：问答题

导游人员怎样去给游客们营造一个轻松愉快的氛围

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题型：选择题

关于磁场的描述，正确的说法是　（　　）

A．沿磁感线方向，磁场逐渐减弱。磁感线从磁体的N极出发，终止于S极

B．磁场的方向就是通电导体在磁场中某点受磁场作用力的方向

C．垂直穿过某一面积的磁感线条数叫磁通量，穿过垂直磁感强度方向的磁感线等于磁感强度，磁感强度的大小叫磁通量密度。

D．在磁场强的地方同一通电导体受的安培力可能比在磁场弱的地方受的安培力小

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题型：实验题

某同学以线状白炽灯为光源，利用游标卡尺两脚之间形成的狭缝观察光的衍射．

(1)若某次观察光的衍射时游标卡尺的示数如图13－2－7所示，则卡尺两测脚间的狭缝宽度为________．

(2)在利用游标卡尺两脚之间形成的狭缝观察光的衍射总结出的以下几点中，正确的是________．

A．若狭缝与灯丝平行，则衍射条纹与狭缝平行

B．衍射条纹的疏密程度与狭缝的宽度有关，狭缝越窄，衍射条纹越窄

C．衍射条纹的间距与光的波长有关，光的波长越长，衍射条纹越宽

D．衍射条纹的间距与光的频率有关，光的频率越大，衍射条纹越宽

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题型：单项选择题

瓜缠藤的内治方是（）

A.参苓白术散

B.仙方活命饮

C.四物消风饮

D.荜薢渗湿汤合桃红四物汤

E.普济消毒饮

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题型：单项选择题

Passage Four

"Much of the sickness and death attributed to the major communicable (可传染的) diseases is in fact caused by malnutrition (营养不良) which makes the body less able to withstand infections when they strike," said Dr. Hiroshi Nakajima, Director-General of the World Health Organization (WHO). "At the same time," he added, "in developing countries today, malnutrition is the cause of 174 million children under five years of age being underweight, and 230 million being stunted in their growth. Such figures represent deprivation, suffering and wasted human potential on a scale that is unacceptable from every point of view. Whether we think interms of humanitarian concern, common justice or development needs, they demand a response, both from national governments and from the international community. "
WHO, working closely with its member states, other United Nations agencies and nongovernmental organizations, is focusing on major crippling (致残的) forms of malnutrition, such as protein-energy malnutrition, vitamin A deficiency (缺乏，不足). At the end of January 1996, 98 countries had national plans of action for nutrition and 41 countries had one under preparation, in keeping with their commitments made at the International Conference on Nutrition in Rome December 1992. The global situation, however, remains grim. Over 800 million people around the world still cannot meet basic needs for energy and protein, more than two thousand million people lack essential micro-nutrients, and hundreds of millions suffer from diseases caused by unsafe food or unbalanced diets.
It is now recognized that 6.6 million out of the estimated 12.2 million deaths annually among children under five—or 54% of young child mortality (死亡率) in developing countries—is associated with malnutrition. In addition to the human suffering, the loss in human potential translates into social and economic costs that no country can afford. In 1990, only 53 developing countries had reliable data on the number of young children under weight; by 1995, 97 countries had such data, nearly all of which included information on stunting and wasting.
In some regions, such as sub-Saharan Africa and south Asia, stagnation of nutritional improvement combined with a rapid rise in population has resulted in an actual increase in the total number of malnourished children. Currently, over two-thirds of the world’s malnourished children live in Asia (especially south Asia), followed by Africa and Latin America.

The tone of the writer’s conclusion concerning the nutrition problem in some countries is ______ .

A．objective

B．pessimistic

C．optimistic

D．concerned

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目前，被艾滋病病毒感染的男性远高于女性，主要原因是男性的不安全性行为和吸毒行为高于女

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