不孕症是指婚后未避孕同居A．3个月未孕者 B．6个月未孕者 C．12个月未孕者 D．

巨大儿超声诊断哪项参数最敏感（）

A.头围

B.腹围

C.小脑横径

D.双顶径

E.股骨长

属于不稳定骨折的是（）.

A.横（形）骨折

B.螺旋骨折

C.斜形骨折

D.粉碎性骨折

E.嵌插骨折

为了摸清某地吸毒人员艾滋病(AIDS)病毒感染情况，1995年确立吸毒者和非吸毒者2个队列，观察起始均未感染AIDS病毒，1997年随访复查，排除队列有变动的人员，检查结果如下：

暴露情况	检查人数	AID感染者
吸毒	500	20
非吸毒	1000	2

试问吸毒人员感染AIDS的相对危险度为

A．10
B．20
C．50
D．100
E．200

关于温抗体自身免疫性溶血性贫血描述不正确的是（）。

A.系免疫功能紊乱自身抗体破坏红细胞所致

B.温抗体多为IgG

C.可继发于结缔组织病

D.Coombs试验可以阴性

E.禁用免疫抑制剂

Manners nowadays in metropolitan cities like London are practically non-existent. It is nothing for a big, p schoolboy to elbow an elderly woman aside in the dash for the last remaining seat on the tube or bus, much less stand up and offer his seat to her, as he ought. In fact, it is saddening to note that if a man does offer his seat to an older woman, it is nearly always a Continental man or one from the older generation.

This question of giving up seats in public transport is much argued about by young men, who say that, since women have claimed equality, they no longer deserve to be treated with courtesy, and that those who go out to work should take their turn in the rat race like anyone else. Women have never claimed to be physically as p as men. Even if it is not agreed, however, that young men should stand up for younger women, the fact remains that courtesy should be shown to the old, the sick and the burdened.

Conditions in travel are really very hard on everyone, we know, but hardship is surely no excuse. Sometimes one wonders what would have been the behavior of these stout young men in a packed refugee train or a train on its way to a prisoner-camp during the war. Would they have considered it only right and their proper due to keep the best places for themselves then

Older people, tired and irritable from a day’s work, are not angels, either--far from it. Many a brisk argument or an insulting quarrel breaks out as the weary queues push and shove each other to get on buses and tubes. One cannot commend this, of course, but one does feel there is just a little more excuse.

If cities are to remain pleasant places to live in at all, however, it seems urgent, not only that communications in transport should be improved, but also that communication between human beings should be kept smooth and polite. All over cities, it seems that people are too tired and too rushed to be polite. Shop assistants won’t bother to assist, taxi drivers shout at each other as they dash dangerously round corners, bus conductors pull the bell before their desperate passengers have had time to get on or off the bus, and so on and so on. It seems to us that it is up to the young and p to do their small part to stop such deterioration.

In the author’s view, the best remedy for coping with the hard conditions in travel in cities would be to（）

A. attach significance to the moral education of young people

B. improve the means of transportation and the public morality

C. treat people, be they young and old, with courtesy and sympathy

D. demand that everyone avoid brisk arguments and insulting quarrels