什么是钢材的石墨化？石墨化对钢的性能有何影响？

下列哪些情况行为与(死亡)结果有因果关系（）

A、甲殴打乙造成小腿骨折，乙因为行走不便，只好搭乘汽车。该汽车在送乙去医院的途中，发生车祸，乙在车祸中丧生。

B、甲在乙的腹部扎了二刀。急忙送乙到附近一家医院抢救，该医院称血库没有血，无法抢救，建议到另一医院。到另一医院后，该医院护士称外科大夫均不在，无法抢救，建议其到第三家医院。到了第三家医院后，乙因失血过多而死亡。该医院的医生说，如果当初第一家或者第二家医院接诊，采取止血措施，不在路上耽误这3个多小时，乙某是不会死亡的。建议他们告第一家和第二家医院医疗事故，请求赔偿。

C、甲向乙茶杯中投放0.5克毒药，丙向乙的茶杯中也投放了0.5克毒药，二人并不知道彼此的行为。乙喝茶后中毒死亡。经鉴定认为，该种毒药的致死量为1克。

D、甲向乙的茶杯中投放某种毒药0.2克，乙恰巧那天醉酒回家，喝下茶杯的水后中毒死亡。经鉴定认为，该种毒药的致死量为0.5克，0.2克本不会致人死亡。但是在乙严重醉酒的作用下，发生死亡结果。

根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

                                                   Are Societies Ageing Too Fast?

     An ageing society is one in which the population of people over the age of 60 is increasing. The global

population at present is about 6 billion with l person in every 10 aged 60 or above. 1._____ This will mean

that for the first time in human history the population of older persons will be larger than the population of

children! What are the causes of this population change?

     2._____ And another is that birth rates have dropped as people, especially women, are educated. Measures

to slow population growth like China's one-child policy, have also contributed to lowered birth rates. The

increase in the aged population is not just an interesting trend, however; it also has severe implications for the

future of global economies.

     People traditionally retire at 65 and live on government pensions. 3._____ Another concern is that as medical

expenses increase with age, the demands of the growing aged population will eventually cause medical systems

to face bankruptcy (破产).

     4._____ They suggest that because people are living longer, they ought to work longer, while governments

need to establish a sound social security system. They also suggest that individuals start saving as soon as

possible to ensure a financially secure retirement. People should also develop good health habits in their youth

to ensure an active and productive old age. 5._____ By finding cures for diseases like Alzheimer's and cancer,

medical bills and the need for care would be drastically reduced.

     Finally, an important step to ensure a bright future for all is to do away with negative stereotypes that see

valuable members of society only as pensioners or patients. It's high time we stopped seeing ageing as a disease

and started playing our parts in securing the future of our ageing societies.

A. Due to ageing problem, cities are facing more challenges.

B. Experts insist that steps should be taken now to prepare for the future.

C. As people grow older, a huge financial burden will be placed on the government.

D. Biomedical research is another tool we can use to deal with the problems of ageing societies.

E. One reason is that dramatic health advances have added 20 years to the average life expectancy.

F. The United Nations projects that by 2050, it will be l in every 5.

G. As is known to all, good habits lead to good health.

设计基本地震加速度为0.15g地区内的建筑，一般地，应按抗震设防烈度（）的要求进行抗震设计。（）

A.6度

B.7度

C.8度

D.9度

视准管的分划值比圆视准器的分划值小，所以视准管的灵敏度（）

A.更高

B.更低

C.一样

D.都有可能