东北虎主要分布于我国长白山、大兴安岭等寒冷地区，而华南虎主要分布于我国长江流域以南。请判断东北虎之所以适应东北寒冷气候的

D

B

360/4=90

解题思路：根据题意，用一只东北虎重213千克乘上4就是这头野牛的重量，要用估算的方法进行计算．

l如3×2≈8hh（千克）．
答：这头野牛如约重8hh千克．
故答案为：8hh．

点评：
本题考点： 数的估算．

考点点评： 求一个数的几倍是多少，用乘法计算即可．

在动物园里浏览 ,我们听到清脆的鸟鸣! 看到了金丝猴 、东北虎、 河马 、袋鼠, 我们玩得可开心了!
这样的了,哈哈.嘿嘿.

题目不完整啊

解题思路：华南虎和东北虎，处于两个不同的区域，存在着地理隔离，由于地理障碍不能进行基因交流，因此属于两个亚种．

A、东北虎和华南虎不是两个物种，不存在生殖隔离，A错误；
B、东北虎与华南虎由于地理障碍不能进行基因交流，是地理隔离导致华南虎和东北虎属于两个亚种，B正确；
C、由A分析可知，C错误；
D、由B向分析可知，D错误．
故选：B．

点评：
本题考点： 物种的概念与形成．

考点点评： 本题的知识点是地理隔离和生殖隔离在物种形成中的作用，对于隔离在物种形成过程中的作用的理解是解题的关键．

解题思路：此题考查的是动物的分类，思考答题．

（1）根据动物体内有无脊柱，把动物分成脊椎动物和无脊椎动物，题中的大山雀、东北虎、鲫鱼、青蛙、竹叶青蛇的体内有脊柱，属于脊椎动物，归为一类；河蚌体内无脊柱，属于无脊椎动物，归为另一类．
（2）鲫鱼生活在水中，用鳃呼吸；大山雀体表有羽毛，卵生，属于鸟类；东北虎身体被毛，胎生哺乳，属于哺乳动物；竹叶青蛇体表有鳞片，生活在陆地上，属于爬行动物；青蛙幼体生活在水中，用鳃呼吸，成体生活在陆地上，用肺呼吸，属于两栖动物；河蚌属于无脊椎动物．
故答案为：（1）有无脊椎骨．
（2）鲫鱼；大山雀；东北虎；竹叶青蛇；青蛙；河蚌．

点评：
本题考点： 动物的分类．

考点点评： 熟练掌握动物的分类知识，灵活对动物进行分类．

在动物园里,我们看到了许多有趣的动物,有猴子、大象、老虎、狮子、东北虎和北极熊等.

解题思路：保护生物多样性最为有效的措施是建立自然保护区，建立自然保护区是指把包含保护对象在内的一定面积的陆地或水体划分出来，进行保护和管理，又叫就地保护．除了建立自然保护区之外，人们还把把濒危物种迁出原地，移入动物园、水族馆和濒危动物繁育中心，进行特殊的保护和管理，又叫易地保护．此外还建立了种质库，以保护珍贵的遗传资源；另外为保护生物的多样性，我国相继颁布了《中华人民共和国环境保护法》、《中华人民共和国森林法》、《中华人民共和国野生动物保护法》、《中国自然保护纲要》等法律，此外对破坏者还采取法制教育和处罚等措施对于我国生物多样性的保护起到了重要的作用．

建立青海湖鸟岛自然保护区为了保护斑头雁等鸟类，属于就地保护；
建立的东北虎繁育中心以保护东北虎，属于易地保护；
将捕杀藏羚羊的偷猎者绳之以法，属于法制管理．
故选：A

点评：
本题考点： 生物多样性保护的意义和措施．

考点点评： 本题考查了保护生物多样性的措施，解答的关键是掌握保护生物的多样性的常见措施，结合题意，仔细分析，即可正确解答本题．

我也才初二.
Hello everyone,my name is XXX,I'm glad to meet you.Let's follow me to visit the zoo.This way,please.
Look at this animal.It is northeast tiger.As you see,It's reddish tan,and it has black stripeds.
我先撤了,下面自己写,这个作文好难,你用的什么教材

不对

D

动物野生动物老虎东北虎

解题思路：根据题意一头牦牛的体重是东北虎的3倍，也就是216千克的3倍，即216×3．

216×3=648（千克）．
答：这头牦牛重648千克．

点评：
本题考点： 整数的乘法及应用．

考点点评： 求一个数的几倍是多少，用这个数乘上倍数即可．

如图为某动物园示意图．
（1）用数对表示出河马馆和熊山的位置．
（2）（8，4）表示的位置是东北虎馆还是海洋馆？
（3）在图中标出下面场馆的位置．
羚羊馆（8，3）蛇馆（2，4）金丝猴馆（7，6）
（1）河马馆（（3，5），熊山（2，1）．

（2）（8，4）表示东北虎馆．

（3）各馆的位置如下：

B.地理上的隔离作用.
A也有道理,不过不如B.
C.D.理由不充分.

1, people for money killing extinction caused the east-northern tiger east-northern tiger. Spam of forest environmental damage heavily, also be to cause the east-northern tiger endangered is also important for another reason. In addition, protect endangered animals, protecting the east-northern tiger is our responsibility.
. 2, you send email to invite friends Susan going to south DanShan play.
Clew you with some students plan a picnic kites photography. Climb
Purpose intensive studies after relaxation
. Time this Saturday at the school gate at eight in the morning, at half past eight buses starting waiting
. Should take enough food, the sun glasses

The Manchurian tiger mainly distributes in north China's Northeast area, Siberia and North Korea. The body color summer wool yellowish brown color, the winter wool is faint yellow. The back and the body side has the many row black narrow stripe, usually 2 approach assumes the willow tree leaf-shape. Is big and is round, on forehead's several black across to the grain, middle are often in cahoots, resembles “the king” extremely the character, therefore has “king of the jungle” the laudatory name .The ear short circle, back the black, the central committee has 1 floccosoids. Dwells in the forest, the bush and the overgrown with weeds region. Lives alone, not settles down, has the domain behavior, the nocturnal habit. The sense organ is keen, the nature is fierce, motion fast, friendly swimming. Preys on the large and middle scale mammal, occasionally eats the small mammal and the bird.

Siberian Tiger (东北虎)
The Siberian tiger (also known as the Amur,Korean,Manchurian,or North China tiger) is the largest and most powerful subspecies of naturally occurring feline.The Siberian tiger is almost totally confined to a very restricted part of eastern Russia,the Amur-Ussuri region of Primorye and Khabarovsk,a location it shares with the Siberian leopard,where they are now being actively protected.About 10% of Siberian tiger populations reside in China.
The tiger population in the Sikhote-Alin was 250 in 1992,increasing to 350 as of 2004,despite significant losses of cubs due to car accidents on the single road that crosses their territory.Illegal poaching has been brought under control thanks to frequent road inspections.It is rumoured that there are still around 20 of these tigers in the Mount Changbai area of China.
As the total population of these tigers fell to 150 in the wild,many subpopulations are possibly not genetically viable,subject to potentially catastrophic inbreeding.However,Russian conservation efforts have led to a revival of the subspecies,and the number of individuals in the Primorsky region of Russia has risen from 450 to 500 in the past decade,indicating positive growth.
The Siberian tiger can weigh as much as 700lb (318 kg) or more.In years past,scientists believed that these cats could weigh up to 800lb (350 kg),but that earlier range,which was based largely on the estimates of hunters,is not now generally accepted.Apart from the size,Siberian tigers are differentiated from other tigers by their paler fur and dark brown,rather than black,stripes.Adept hunters,they prey primarily on red deer,wild boar,roe deer,sika deer,and goral,a goatlike animal,but will also take smaller prey like hares,rabbits,and salmon.They have sometimes even been known to kill and eat small Asiatic black bears.Since it is estimated that 85% of a Siberian tiger's diet is composed of red deer and wild boar,protecting these and other prey animals from illegal hunting may be just as important to the tiger's survival as preventing direct killing of the big cats.
Siberian tigers some times cross breeds with Bengal tigers.A white Siberian tiger is usually the result of such cross breeding and it is unsure whether pure white Siberian tigers exist.
A Siberian tiger named Hodori was chosen to represent the 1988 Summer Olympics held in Seoul,South Korea.
Siberian tigers in captivity
The captive population of Siberian tigers comprises several hundred specimens.A majority of these tigers are found in Europe,North America and Japan,but there are also a few specimens living in Asian zoos.The Siberian tiger is bred within the Species Survival Plan (SSB),a project based on 83 wild caught tigers.According to most experts,this population is large enough to stay stable and genetically healthy.Today,approximately 160 Siberian tigers participate in the SSP,which makes it the most extensively bred tiger subspecies within the program.There are currently no more than around 255 tigers in the tiger SSP from three different subspecies.Developed in 1982,the Species Survival Plan for the Siberian tiger is the longest running program for a tiger subspecies.It has been very fortunate and productive and the breeding program for the Siberian tiger has actually been used as a good example when new programs have been designed to save other animal species from extinction.
The Siberian tiger is not very difficult to breed in captivity,but the possibility to release captive bred specimens into the wild is small.Conservational efforts that secure the wild population are therefore still of imperative importance.If a captive bred Siberian tiger were to be released into the wild,it would lack the necessary hunting skills and starve to death.Captive breed tigers can also approach humans and villages since they have learned to associate humans with feeding and lack the natural shyness of the wild Siberian tigers.In a worst case scenario,the starving tigers could even become man-eaters.Since tigers must be taught how to hunt by their mothers when they are still cubs,a program that aimed to release captive bred Siberian tigers into the wild would face great difficulties.

解题思路：根据生活经验、对质量单位，长度单位和数据的大小，①可知计量大象约重用“吨”做单位，是4吨；
②计量一个西瓜约重用“千克”做单位，是4千克；
③计量一只东北虎的体重用“千克”作单位，是100千克；
④计量小明的体重用“千克”做单位，是42千克；
⑤计量一袋大米重用“千克”做单位，是50千克；
⑥计量一辆东风汽车载重用“吨”做单位，是8吨；
⑦计量爸爸的身高用“厘米”做单位，是178厘米；
⑧计量体重用“千克”做单位，是65千克．

①大象约重4吨；
②一个西瓜约重4千克；
③一只东北虎的体重是100千克；
④小明的体重是42千克；
⑤一袋大米重50千克；
⑥一辆东风汽车载重8吨；
⑦爸爸的身高是178厘米；
⑧体重是65千克．
故答案为：吨，千克，千克，千克，千克，吨，厘米，千克．

点评：
本题考点： 根据情景选择合适的计量单位．

考点点评： 此题考查根据情景选择合适的计量单位，要注意联系生活实际、计量单位和数据的大小，灵活的选择．

原生动物：草履虫
腔肠动物：水螅,水母
环节动物：蚯蚓
软体动物：河蚌,蜗牛
节肢动物：蚕,金龟子,蜻蜓,蜘蛛
鱼类：青鱼,泥鳅
两栖动物：娃娃鱼,青蛙
爬行动物：壁虎
鸟类：鸵鸟,鹦鹉
哺乳动物：白暨豚,东北虎

解题思路：一只东北虎重215千克，一头野牛的体重是东北虎的3倍，根据乘法的意义可知，用东北虎的重量乘以3即是野牛的重量，列式为：215×3．

215×3=645（千克）．
答：这头野牛有645千克．

点评：
本题考点： 整数的乘法及应用．

考点点评： 完成本题的依据是乘法的意义，即求几个相同加数和的简便计算．

美国人体虎.

解题思路：东北虎的只数是白虎的7倍，把白虎的只数看作标准量1倍，设白虎x只，则东北虎有7x只，再根据一共有东北虎和白虎16只，得到等量关系东北虎的只数加上白虎的只数就是一共的只数，列方程解答即可．

设为白虎x只，则东北虎有7x只，由题意可得：
x+7x=16，
8x=16，
8x÷8=16÷8，
x=2，
答：白虎有2只．

点评：
本题考点： 和倍问题．

考点点评： 此题是简单的和倍应用题，要先设标准量为x只，再根据一共有东北虎和白虎16只，列方程解答即可．

20：马和驴虽然可以生出骡子,但骡子不能繁殖后代,所以马和驴存在生殖隔离,是不同物种.
25：一共有2*10^4*10^9个基因乘以突变率10^-5=2*10^8

是翻译成英文吧!
Tiger is the world's endangered animals is one.Tiger's high economic value,meat and offal of medicine to the treatment of many diseases,such as the Northeast tiger killed mercilessly.This is indeed a very hateful.The number of existing wild Siberian tiger is only just over 400 in China's less than the number 20,and I think we should try our best to protect them.

一头梅花鹿重210÷2=105千克
所以头犀牛的体重105×19+5=2000千克

应该是600,因为后面问的大约,应该是估算.如果前面说野牛大约是东北虎的3倍那么就应该是639

B

解题思路：一只东北虎重213千克，一头野牛的体重是东北虎的3倍，根据乘法的意义可知，用东北虎的重量乘以3即是野牛的重量，列式为：213×3．

213×3=639（千克）．
答：这头野牛大约有639千克．

点评：
本题考点： 整数的乘法及应用．

考点点评： 完成本题的依据是乘法的意义，即求几个相同加数和的简便计算．

解题思路：依据除法意义，用360分别除以4、9，运用整数除法计算方法即可解答．

360÷4=90（千克）
答：鸵鸟中90千克；

360÷9=40（千克）
答：企鹅重40千克．

点评：
本题考点： 整数的除法及应用．

考点点评： 本题属于比较简单应用题，只要明确数量间的等量关系，代入数据即可解答．

正确.这是按照生物分类学排列的.即：生物界,动物界,脊索动物门,哺乳动物纲,食肉目,猫科,虎属,东北虎种.因此是正确的.

解题思路：对于生物的保护分为就地保护和迁地保护两种．东北虎需要就地保护主要是建立自然保护区，这样的保护方法应是别无选择的．至于伤人问题，只要注意虎的生存环境保护，尽量减少人为干扰是可以避免的．由于生态平衡遭到破坏，虎的生存范围日益减小，食物逐渐缺乏，以前不会袭击人的老虎开始主动伤人，投喂食物只能解决暂时问题，恢复其生存环境才是重中之重．

对于东北虎这样的国家重点保护动物，结合它的生活特性，实行就地保护是最为有效的措施，而就地保护主要是建立自然保护区，这样的保护方法应是别无选择的．至于伤人问题，只要注意虎的生存环境保护，尽量减少人为干扰是可以避免的．
故选：A．

点评：
本题考点： 生物多样性保护的意义和措施．

考点点评： 此类题型主要考查学生对生物多样性相关知识的了解，属于基础题．

207×3+27，
=621+27，
=648（千克）；
答：这头野牛重648千克．

设一只羊重x千克
6x+8=260
6x=260-8
x=252÷6
x=42

Dear the Human:
I am a Siberian Tiger.Long long time ago we are the king of the forest.But now you cut down the forest then we have not enough food to eat and enough lands to live on.And you kill us for our fur and our bones.
What have you done?Have you losed your frieands or fanmily,haven't you?Did you feel sad?We are animals,too.We feel sad when we lose our friends or family,too.
Anyone likes fighting.So please make us live in peace and save our home save the nature!
We are the nature's sons.I hope we can be friends again.
Yours,
Panthera tigris altaica(学名）

东北虎的只数是斑马的五分之三
可以这样想：东北虎占斑马的几分之几

尾巴长 =180×1/3-40=20厘米

解题思路：科学探究的方法有很多，像观察、调查、实验、收集资料和分析资料等都属于科学探究常有的方法；该题要从科学探究的基本方法方面考虑解答．

为了了解某些情况而进行的多方面的考察是调查，例如我国的森林资源清查、人口普查等就属于调查；观察是指直接用肉眼或者借助仪器对一定事物进行的有目的、全面细致的观望、记录． 探究东北虎的生活习性用的是观察的方法．
故选：B

点评：
本题考点： 科学探究的基本方法．

考点点评： 此题考查了科学探究的基本方法，科学探究的基本方法有很多，要注意分清和识别它们．

第一件：“阿哥”丛林救幼虎,并养育了三个月,期间他们产生了感情
第二件：发虎归山后,“阿弟”救了“阿哥”一命
第三件：“阿弟”再次遭遇人类的陷阱,使得它不再信任人类

B

以前看过资料：
有些濒危野生动物数量的减少并不一定全部是人为滥捕滥杀的结果
比如说大熊猫数量的稀少,也与它在进化过程中不能很好的适应环境有关
例如：它几乎专一性的吃竹子,营养物质匮乏,导致体质衰弱
它生下来的幼崽发育的很不完全,生存能力很弱……
这个意思是说这种动物明明应该是被大自然淘汰的,进行人工保护的话,就违反自然规律了
这个问题有难度,我就想了这么多

For human's selling tiger bones and tiger skins ,The humanity slaughters the Manchurian tiger .

解题思路：除病毒外细胞是生物体结构和功能的基本单位．

除病毒外细胞是生物体结构和功能的基本单位．生物体的组织、器官、系统都是由细胞构成的，生物体的细胞有细胞膜，可以保护细胞，同时控制物质的进出，使之从结构上成为一个独立的单位；细胞内有细胞核内含有遗传物质；细胞质里有能量转换器--线粒体，把有机物分解并释放出能量供细胞生命活动利用，使之从功能上成为一个独立的单位．因此从细胞的结构及功能的角度来看，细胞是生物体进行生命活动的基本单位．
故选：A．

点评：
本题考点： 细胞是生命活动的基本结构和功能单位．

考点点评： 关键点：除病毒外细胞是生物体结构和功能的基本单位．

D

Dongbei tiger is called by Siberian tiger internationally.Because they live mainly in the far east of the Russia. Also in the Heilongjiang Province of our country, there are a few of them.
As i know, Siberian tiger is the strongest predottors in the land and it prey many kinds of animals most of which are deers and sometimes even bears and wolves. Although Siberian tigers usually live far away the people, but they are still killed by some people because of their economic fenifits.So the number of tigers are decreasing sll the time .they are much needed to be protected!
回答者： 202.118.230.* 2010-9-24 15:03