、When we look at animals，we know that they are not humans（人類）.But how do our closest friends -- dogs see us？（1）

D

D

Or do they think that we are just different-looking dogs？
（2）

A

A

For example，the cuckoo（布谷鳥） will lay（產卵） its eggs in the nest（鳥巢） of another kind of birds.The other birds will feed the baby cuckoos，even though（即使） they look nothing like their babies.This is because feeding little ones is quite natural（自然的） for birds.
   Other animals may just divide（劃分） the world into animals they eat and animals that eat them.（3）

B

B

Sheepdogs leave their mothers when they are born.They grow up with sheep，and come to see them as their family.For this reason，they never attack（攻擊） the sheep.（4）

E

E

They probably think the sheep are dogs，too，but we can't be certain.
   Similarly（類似地），if you raise（飼養） a dog from birth，the way it sees the world will be different from a dog that grows up with other dogs.It may think it is the same kind of animals you.（5）

C

C

A Russian boy named Ivan Mishukov，born in 1998，was raised by dogs for two years and came to believe that he was a dog himself.

根據材料內容，從下面五個選項中選出能填入文中空缺處的最佳選項，使短文意思通順，內容完整。
A.You may be surprised to learn that many kinds of animals do not care such differences very much at all.
B.When it comes to dogs，though，there is no simple answer to this question.
C.This can even be true of humans.
D.Do they know that we are humans？
E.Instead，they help protect them.