问题 单项选择题

关节脱位的特有体征是()

A.肿胀

B.疼痛

C.功能障碍

D.异常活动

E.关节囊空虚

答案

参考答案:E

完形填空

Some years ago, writing in my diary used to be a usual activity. I would return from school and   小题1: (spend) the expected half hour recording the day’s events, feelings, and impressions in my little blue diary. I did not really need to express my emotions by way of words, but I gained a certain satisfaction from seeing my experiences forever   小题2:  (record) on paper. After all, isn’t accumulating memories a way of preserving the past?

  When I was thirteen years old, I went on a long journey on foot in a great valley,   小题3:  (well-equip) with pens, a diary, and a camera. During the trip, I was busy recording every incident, name and place I came across. I felt proud to be spending my time   小题4:  (productive), dutifully preserving for future generations a detailed description of my travels. On my last night there, I wandered out of my tent, diary in hand. The sky was clear and lit by the glare of the moon, and the walls of the valley looked threatening behind their screen of shadows. I automatically took out my pen….

  At that point, I understood that nothing I   小题5: (write) could ever match or replace the few seconds I allowed myself to experience the dramatic beauty of the valley. All I remembered of the previous few days were the dull characterizations I   小题6:  (set) down in my diary.

  Now, I only write in my diary when I need to write down a special thought or feeling. I still love to record ideas and quotations that strike me in books, or observations that are particularly meaningful. I take pictures, but not very often—only of objects   小题7:  I find really beautiful. I’m no longer blindly satisfied with having something to remember when I grow old. I realize that life will simply pass me by if I stay behind the camera, busy   小题8:  (preserve) the present so as to live it in the future.

I don’t want to wake up one day and have nothing but a pile of pictures and notes. Maybe I won’t have as many exact representations of people and places; maybe I’ll forget certain facts, but at least the experiences will always remain inside me. I don’t live to make memories—I just live, and the memories form themselves.

单项选择题

近几年,通信技术网络的超高速化已成为世界上的发展潮流。空间技术与计算机融合成跨越时间与空间的信息基础结构,它将逐渐深入千家万户,从根本上改变人们的生产、生活和相互交往的方式,加速人类文明和文化的传播,增进相互理解和全球意识。 空间信息高速公路,这一名词是借鉴信息高速公路概念,也是信息高速公路的拓宽与延伸。所谓空间信息高速公路,我们可以形象地将它理解为以卫星、光纤再辅之以其他通信手段作为“公路”,而以集电脑、电话、传真等为—体的多媒体作为“汽车”,使信息高速传递并能共享的通信网络。这种网络遍布全国乃至全球。在我国则将它称之为国家经济信息化基础设施,其内涵包括四项要素:网络与通信、计算机与信息化设备、信息资源与服务、人与信息化环境。 卫星通信和数字网络光缆就像高速公路一样,是促进社会经济发展的基础设施。它不仅是地面光缆数字通信网络系统,而且还包括通信卫星、卫星定位系统和环境、灾害监测技术系统。此外,还有不断更新的社会、经济统计数据库和自然资源数据系列,以及宏观调控、规划决策和工程设计服务及知识库、逻辑推理机等人工专家系统,这样,才能有效地实现以信息交流代替人流、物流与能量流。 加速发展空间技术,多方面、高效率地利用空间技术,特别是充分利用空间信息资源,促进社会生产力的发展,已成为当今世界的共识。通信卫星具有通信容量______、可靠性______、传输距离______、不受地理环境影响等许多优点,所以备受各国的重视和欢迎。在空间信息高速公路中,卫星无线电信频率宽,极容易实现双向高速率的数据和可视电信业务,并适用于单相多路的电视节目以及新闻报道,对大多数用户都有实用价值。对发展中国家来说,空间信息高速公路的建设,可弥补通信基础设施差与区域性通信空缺之不足。例如,地面信息高速公路的成本昂贵,需要10~15年甚至更长时间才能建成,是一个无法在短期内普及服务的巨额投资项目,而卫星接收设备费用大约只需200美元,其技术是现成的,是一个在短期内便能普及并能满足绝大多数用户需求的业务项目。

对“卫星通信和数字网络光缆”理解不正确的一项是()

A.它是地面光缆数字通信网络系统

B.它能以信息交流代替人流、物流与能量流,从而使后者变得无意义

C.它包含各种各样数据库系列和知识库系列

D.它具有通信卫星、卫星定位系统和环境、灾害监测技术系统