Some mammals migrate（迁徒）. One of these is the caribou（驯鹿）. T

whales aren't____,they are mammals(哺乳动物）
A.fish B.fishes
请说一下原因``
谢勒哈

It is the largest mammals in the word that live on land.It lives in familes.it is a plant-eater.Because it is such a big animal,it needs to eat lots of leaves and grass.It spengds as much as twenty hours a day eating!It has four teeth and two"tusks".

英语阅读题
In the evolution of mammals from reptiles(爬行动物), there was a succession of physical changes: the development of warm blood, body hair instead of scales, and the beginning of the nursing of the young. This radical physical transformation provided mammals with a greater tolerance for external temperature and required reliance on specialized food types. When the dominant dinosaurs（恐龙）became extinct, the Age of Mammals began. For the rest 60 million years mammals expanded into the biological vacuum which they were better equipped to exploit than all but a few varieties of reptiles.
The habitat of life forms on earth has been the entire planet, conveniently dividing the world into the birds of the air, the fish of the sea, and the creatures of the land. The evolutionary process also created sea-dwelling mammals who appeared to reverse the process of evolution as they returned to the sea. The whales’ limbs became flipperlike, and they lost the hair on their bodies, suiting them better to aquatic life.
On the other hand, in the course of the evolution of birds from reptiles, there was a succession of changes in the bone, muscle, and skin structures of the animals. This wholesale restructuring of some reptiles over a period of thousands of years equipped the new animals to escape their predators and to find food more easily. But the evolutionary process did not stop there. Once adapted to flight, some birds continued to change and the process seemed to reverse itself. As penguins（企鹅）adapted to marine life, their wings changed to flippers and their feathers to a waterproof covering, thus suiting the birds for a semi-aquatic existence.
1. The Age of Mammals began when ____
A. animals evolved from reptiles
B. animals nursed the young
C. animals were more tolerant to external temperature
D. the dominant dinosaurs died out
2. It can be concluded from this passage that the ancestors of whales ____
A. were fish B. chased reptiles
C. lived on the land D. had too many offspring
3 In paragraph 2, the word ‘aquatic’ is closest in meaning to ____
A. of earth B. of land
C. of river D. of water
4. Certain reptiles gradually became able to escape quickly by ____.
A. acquiring new structural features
B. becoming smaller and stronger
C. finding food more easily
D. changing their eating habits
5. Which of the following would be the best title for this passage?
A. The Evolution of Mammals.
B. The Evolution of Life on Earth.
C. The Disappearance of Reptiles.
D. The Adaptation of Whales and Penguins.

（共40题、总分40分）1.( ) some mammals came to live in the sea is not known (本题分

2013人教版八上英语判断题
Bats are the only flying mammals (哺乳动物) in the world.They can’t see very well.It was long believed and still is in many places,that all bats are blind."Blind as a bat" is often heard.Yet they have no trouble in flying on the darkest nights and finding their way around very well.How can bats fly and see at night?They fly by radar.
The bat’s radar system works the same way as the one that ships and planes use.As a bat flies through the air,it makes a sound that is too high for our ears to hear.If the sounds hit things,they come back.The bat’s ears receive the messages.In this way they are able to tell where the things are.Bats go out to look for food at night.In the daytime they hang in some dark places.Some people have the bats as bad animals.
根据短文内容,判断正（T）误（F）
()1.The bat is a bad bird.
()2.The bat has no trouble flying on the darkest nights because it has a kind of radar sys-ten to help it.
()3.The bat goes out for food all day.
()4."As blind as a bat" maens a person who is not able to see what is clear to others.
()5.Some people think that the bat is bad because it is blind

八年级上册英语阅读理解：dolphins are not fish.they are mammals they live in groups and

一篇the largest mammals in the world的短文,求它的问题:what is the title of the table等等
深圳版本……

___D__ some mammals came to live in the sea is not known.[ ] A.Which B.Since C.Although D.How
为什么不用which 选D 但选how是做known的宾语?

英语单项求教
It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.
A.that; while B.what; while C.that; as D.what; as
选出来后

____some mammals came to live in the sea is not known.能用which吗

Why Mammals with a high rate of respiration need to have a high heart rate.

．Elephants, which are the largest mammals on the earth, have almost no natural enemies ______ human beings. A．rather than B．other than C．more than D．less than

The disappearance of dinosaurs made___ the rise of mammals which gave birth to young baby animals.
A.it was possible B.it possible C.possible to be D.possible

为什么A
11.This disappearance made ____ the rise of mammals on the earth.
A.possible B.everything possible C.it possible D.it was possible

分析下这个句子
A tiny mutation in a gene common to mammals may have changed the destiny of humanity.

英语翻译
The most common animals are mammals ,birds ,fish and insects.
Mammals give birth to their young .They feed them on milk .Birds,insects and most fish come from eggs Birds have feathers ,fish have scales,insets have three parts on their bodies;head,thorax and abdomen.

It feeds mainly on medium sized mammals such as deer or wild pigs,but is also known to eat fish.
分析句子成分

____cats and ___tigers belong to ___same family of mammals.
A.The；/；the； B.The；the；/ ； C./ ；/ ；the；D./ ；/ ；a；
求详细解题过程 求普及下语法

The spread of mammals happened after the disappearance of the dinosaurs.求翻译

雅思判断题求解
原文in most mammals,both hemispheres inherited.
题目in mammals, both hemispheres inherited.
我的答案是ng.参考答案是f 我就是在这两个上面犹豫不决.
谁能告诉我一针见血的解决办法

问一道SAT语法题
yawning is nearly universal among mammals,but birds,reptiles,and even fish also yawn,（ perhaps for the same reasons ）that mammals do.正确
为什么 possibly with similiar reasons

Here we are,a mere handful of weak and defenceless mammals.
这里的前半句是倒桩 那么句子后面的是we的同位语么 不连在一起语法也没有问题么?

帮忙修改一段话,主要是语法~
wolves are mammals.Compare with human,wolves not have high IQ,but they also have typical behavior of mammals.For example,wolf have strict hierarchy,division of laber between the gender and the cooperation between partners.Like human,wolves are the typical social animals,they have strict hierarchy.Wolves are similar to human.Both have a head of the family.For wolf,the family unit,the head of the family are strong couple.In human's family,also have 1 or 2 people decide to a family life direction.In the wolves group,female wolves have strong family values,some female wolves voluntary feed other wolf's cub.Sometimes they can form ‘kindergarten’ mode.Male wolves look for foods and protect female wolves andtheir cub.Conversely,human feed other people's children for earn money,sometimes,male stay at home take care of children.Wolves successful catch prey rely mainly on cooperation.In similar way,human always achieve the goal by cooperation.

Dophina are not fish .They are mammals .
Dolphins are not fish.They are mammals(哺乳动物).They live in groups and speak to each other in their own language.But they are quite different from almost all land animals.Their brain(大脑) is as big as men’s and they live a long life—at least 20 or 30 years.
Like some animals,dolphins use sounds to help them find their way around.They also use these sounds to talk to each other and to help them find food.They do not use their ears to receive sounds,but use the jaw — the lower part of the mouth.
It is strange that dolphins are friendly to men,and for thousands of years,there are many stories about dolphins and men.In the 19th century,in a dangerous part of the sea near New Zealand,there was a dolphin.The seamen liked him very much and gave him a very good name,Jack.From 1871 to 1903,Jack met every boat in the area and showed it the way.In 1903 a passenger on a boat with the name of “The Penguin” shot and hurt Jack.Luckily the dolphin didn’t die,and after a long time he was well again.He guides the boats through the area for nine more years,but he refused to help the boat “The Penguin”.
Today,some people still kill dolphins,but many countries in the world now protect them.In these places,people are not allowed to kill them.
1 The underline word jaw means _________in Chinese.
A.下颚 B.嘴巴 C.鼻子
2.Who was Jack?
A.The writer B.A dolphin C.A seaman
3.The dolphin guides the boats for about________.
A.32 years B.9 years C.41 years
4.How do dolphins find their way?
A.They use sounds to find the way.
B.They use their noses to smell the way.
C.They use their eyes to see the way.
d.They use their ears to hear the way.
5.According to the passage,which of the following is NOT right?
A.Dolphins are not fish.
B.Dolphins don’t live in groups.
C.Dolphins are kind and friendly to people.

英语分子成分分析
It should be obvious that cetaceans are mammals.
It是形式主语,指代cetaceans.
should be obvious在句子中是什么结构呢.