单项选择题

肛门周围脓肿的主要表现是

A．肛周持续跳痛
B．排脓血便
C．食欲不振、乏力
D．直肠坠胀感

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环境污染物对社区居民健康的影响类型不包括
A、急性危害
B、慢性危害
C、远期危害
D、非特异性危害
E、生物地球化学性疾病

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An industrial society, especially one as centralized and concentrated as that ofBritain, is heavily dependent on certain essential services: for instance, electricity supply, water, rail and road transport, the harbors. The area of dependency has widened to include removing rubbish, hospital and ambulance services, and, as the economy develops, central computer and information services as well. If any of these services ceases to operate, the whole economic system is I danger.
A、The whole economic system in Britain is interdependent.
B、The British economy is centralized and concentrated.
C、Certain essential services are important in Britain.