[单选题]飞行预报应当由（）签发。
A.报告室
B.区域管制室
C.申请人
D.受理飞行申请的报告室或区域管制室

Protection of the environment is based on a principle that is beginning to be used in the field of jurisprudence. The principle has to do with property rights. The idea is that we all have a property right in the air and water around us. If a business firm pollutes that air or water, their act in so doing constitutes damage to something we own—just as if the firm had dropped a smoke bomb down our chimney. Our legal ease against such a firm is then baaed on the complaint that we deserve compensation for an infringement of our right to use our private property as we please ( provided we don’ t interfere with the same rights of a neighbor). Assuming we win the case, the offending firm then has to pay us for damaging our property—the air or water we "own".
And so protection of the environment, specifically the control of pollution, now rests on the idea that we, as members of the public, share a right to clean air and water and to the good health t
A. entrepreneurs are more sensible than the community
B. the community expects entrepreneurs to increase their profits as much as possible
C. in terms of waste disposal the interests of the enterprise and the community conflict
D. the community desires the waste to be carried to any other places

There are many older people in the world and there will be many more. A little-known fact is that over 60 percent of the older people live in developing countries. According to the World Health Organization, by 2020 there will be 1 billion, with over 700 million living in developing countries.
It is a surprising fact that the population ageing is particularly rapid in developing countries. For example, it took France 115 years for the proportion of older people to double from 7 percent to 14 percent. It is estimated to take China a mere 27 years to achieve this same increase.
What are the implications of these increased numbers of older folk One of the biggest worries for governments is that the longer people live, the more likelihood there is for diseases and for disability (残疾). Attention is being paid to the need to keep people as healthy as possible, including during old age, to lessen the financial burden on the state.
Another significant p
A. be treated differently in different cultures
B. enjoy a similar lifestyle
C. be ignored as society changes
D. be valued by the younger generations