阅读下文,完成问题。 ①森林、海洋和湿地是地球上三类重要的生态系统。湿地是指天

题型:阅读理解与欣赏

问题:

阅读下文,完成问题。

  ①森林、海洋和湿地是地球上三类重要的生态系统。湿地是指天然和人工、长久或暂时性的沼泽地、湿源、泥炭地或水域地带,带有静止或流动、咸水或淡水、半咸水或咸水水体者,包括低潮时水深不超过6米的水域。湿地的价值表现在它是许多化学物质、生物物种和基因的源、汇和库。

  ②湿地与人类的生存、繁衍、发展息息相关,是自然界最富生物多样性的生态景观和人类最重要的生存环境之一,它不仅为人类的生产、生活提供多种资源,而且具有巨大的环境功效,在抵御洪水、调节径流、蓄洪防旱、控制污染、调节气候、控制土壤侵蚀、促淤造陆、美化环境等方面都具有其他系统不可替代的作用。它通过生态过程为人类提供淡水资源、粮食、肉类、鱼类、药材、能源以及多种工业原料等生态系统产品。此外,丰富秀丽的自然风光,使湿地成为人们观光旅游的好地方,并且具有关学价值。同时,复杂的湿地生态系统、丰富的动植物群落、珍贵的濒危物种、宝贵的文化遗址等,又使湿地具有教育和科研价值。湿地这些综合功能从来都是人类发展和社会进步的环境及物质基础。

  ③据专家测算,仅占地球陆地生态系统总面积6%的湿地生态系统,每年提供的生态服务价值约占陆地生态系统生态服务总价值的45%左右;仅占地球表面积1%的淡水湿地,生活在其中的物种却占到了全球物种总量的40%以上。

  ④我国的湿地生态环境类型众多,其间生长着多种多样的生物物种,不仅数量多,而且有很多属中国特有,具有重大的科研价值和经济价值。据初步统计,中国的内陆湿地植被约有高等植物1548种、高等动物1500多种。中国有淡水鱼类770多种或亚种,其中包括许多洄游鱼类,它们都需借助湿地系统提供的特殊环境产卵繁殖。中国湿地的鸟类种类繁多,在亚洲57种濒危鸟类中,中国湿地内就有31种,占54%;全世界雁鸭类有166种,中国湿地中就有50种,占30010;全世界鹤类有15种,中国仅记录到的就有9种;此外,还有许多是属于跨国迁徙的鸟类。

  ⑤在中国湿地中,还有一些是世界某些鸟类唯一的越冬地或迁徙的必经之地,在鄱阳湖越冬的白鹤就占世界白鹤总数的95%以上。鄱阳湖自然保护区位于江西省北部,面积为22400公顷,是1992年我国第一批列入《湿地公约》国际重要湿地名录的中国湿地之一。该保护区受修河水系和赣江水系影响,枯水期水落滩出,形成草洲河滩与9个独立的湖泊;丰水期9个湖泊融为一体,形成一片汪洋的鄱阳湖水。该保护区已记录到湖泊浮游植物有54科,水生维管束植物38科102种。该保护区是迁徙水禽极其重要的越冬地,共有鸟类近250种,其中水禽108种,主要水禽有白鹤、白鹳、天鹅等多种雁鸭类。据1998年冬季的观测,在这里越冬的候鸟近10万只,其中白鹤1500多只、白枕鹤1000多只、小天鹅2000多只、白琵鹭2000多只、雁鸭类3万多只。

  ⑥作为我国的首都,北京也有很多湿地资源。其中天然河流湿地占3.5万公顷:北京有大小河流200多条,分属于永定河、潮白河、北运河、蓟运河和大清河,河流面积合计5000公顷左右;人工库塘、湖泊湿地有1.5万公顷,但目前保存典型的芦苇、香蒲沼泽湿地很少,面积较大的仅有顺义汉石桥、延庆野鸭湖、门头沟三家店等处,有2000公顷左右。

  ⑦正是有了这些湿地的存在,才使得自然环境如此丰富多彩,人们也因为有了湿地的存在免遭很多灾难。

1.下列推断不符合文意的一项是(  )

A.湿地是地球上三类重要的生态系统之一。

B.河流、湖泊、水库、稻田以及低潮时水深不超过6米的海水区都属于湿地。

C.根据湿地的作用,我们也可以说湿地是“气候调节器”。

D.湿地与人类的生存、繁衍、发展息息相关,其价值远高于陆地。

2.概括文章第④自然段的内容。

_______________________________________

3.下列对鄱阳湖自然保护区的说明不正确的一项是(  )

A.鄱阳湖自然保护区是列入《湿地公约》国际重要湿地名录的中国湿地之一。

B.鄱阳湖自然保护区枯水期和丰水期形态的不同是受修河水系和赣江水系的影响。

C.鄱阳湖自然保护区是世界鸟类唯一的越冬地,在那儿越冬的白鹤占世界白鹤总数的95%以上。

D.鄱阳湖自然保护区有水禽108种,主要包括白鹤、白鹳、天鹅等多种雁鸭类。

4.北京市的湿地资源有_______和_______两种类型。

5.为介绍我国湿地的鸟类,文中集中运用了两组数据,请分别指出其所在的自然段,并说说这两组数据各说明了什么。

第一组:第_________自然段,说明了_______________________________________

第二组:第_________自然段,说明了_______________________________________

考点:说明文阅读
题型:阅读理解与欣赏

中心线是指()

A.X线束中心部分的一束X线

B.X线束中心部分的一条射线

C.X线束照射在胶片中心的那一条射线

D.X线束照射在胶片中心的那一束X线

E.以上均不对

题型:阅读理解与欣赏

固定资产核算系统中,信息查询输出功能可以输出固定资产( )。

A.卡片
B.明细账
C.折旧表
D.以上全部

题型:阅读理解与欣赏

Questions 91-95 are based on the following passage.
It is amazing how many people still say, "I never dream", for it is now decades since it was established that everyone has over a thousand dreams a year, however few of these nocturnal productions are remembered on waking. Even the most confined "non-dreamers" will remember dreams if woken up systematically during the Rapid Eye Movement (REM) periods. These are periods of light sleep during which the eyeballs move rapidly back and forth under the closed lids and the brain becomes highly activated, which happens three or four times every night of normal sleep.
It is a very interesting question why some people remember dreams regularly—perhaps several a night on occasion—while others remember hardly any at all under normal conditions. In considering this, it is important to bear in mind that the dream tends to be an elusive phenomenon for all of us. We normally never recall a dream unless we awaken directly from it, and even then it has a tendency to fade quickly into oblivion.
Given this general elusiveness of dreams, the basic factor that seems to determine whether a person remembers them or not is the same as that which determines all other memory, namely degree of interest. Dream researchers have made a broad classification of people into "recallers" —those who remember at least one dream a month—and "non-recallers", who remember fewer than this. Tests have shown that cool, analytical people with a very rational approach to their feelings tend to recall fewer dreams than those whose attitude to life is open and flexible. Engineers generally recall fewer dreams than artists. It is not surprising to discover that in western society, women normally recall more dreams than men, since women are traditionally allowed an instinctive, feeling approach to life.
In modern urban-industrial culture, feeling and dreams tend to be treated as frivolities which must be firmly subordinated to the realities of life. We pay lip-service to the inner life of imagination as it expresses itself in the arts, but in practice relegate music, poetry, drama and painting to the level of spare-time activities, valued mainly for the extent to which they refresh us for a return to work. We discourage our children from paying much attention to anything that might detract from the serious business of studying for exams or making a living in the "real" world of industry and commerce.

Many people are unaware that they dream because ______.

A.their dreams fade very quickly

B.they do not recall their dreams

C.they sleep too heavily

D.they wake up frequently

题型:阅读理解与欣赏

炝的菜肴可使用米醋,不使用酱油,以保持菜肴的清淡无汁。

题型:阅读理解与欣赏

OPGW导引光缆安装要求是什么?

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