问题 选择题

蛙不抚幼,但幼蛙能有效地像成蛙一样捕食昆虫,这种行为属于动物的(  )

A.适应行为

B.学习行为

C.先天性行为

D.经验行为

答案

先天性行为是指动物生来就有的,由动物体内的遗传物质所决定的行为,称为先天性行为例如:蜜蜂采蜜,蚂蚁建巢,蜘蛛织网,鸟类迁徙等. 先天性行为是动物的一种本能行为,不会丧失.学习行为是动物出生后通过学习得来的行为.动物建立学习行为的主要方式是条件反射.参与神经中枢是大脑皮层不是与生俱来的而是动物在成长过程中,通过生活经验和“学习”逐渐建立起来的新的行为.蛙不抚幼,但幼蛙能有效地像成蛙一样捕食昆虫,是幼蛙生来就有的,不学就会的,由体内的遗传物质所决定的先天性行为.

故选C.

选择题
阅读理解

阅读选择填空。

       1   - It is also, perhaps, the gentlest, but not always! Elephants are like us in some ways. They live for a

long time- fifty or sixty years. They can remember things very well.   2   If a female elephant dies, her

daughters and her grand daughters are sad for many months. They stay with the dead body. Then they carry a

bit of it away with them. They never forget a dead friend.

     Elephants are like us, but they are also different. They live in families of females.   3   But the females will

soon send them away. An elephant family keeps only its daughters, mothers and its great grandmothers.

     The females stay together for fifty, sixty...,a hundred years. The older animals look after the younger ones. 

  4      

     And what happens to male elephants? Well, the young males stay with their mothers for a time. Then they

must leave the family. The females just send them away. A male elephant does not often have a friend.    5   

Sometimes the females call a male elephant. He can visit them then, and stay for a time. But soon his "wife" and

sisters send him away again. The females have a very happy family life. What do the male elephants think about

it? We don't know.

A. They never forget great sadness or great happiness.

B. He lives apart away from the family, and often away from other male elephants.

C. They like to play with each other and sometimes are injured.

D. There will be a few young males-a few "baby boys".

E. The mothers teach their daughters and set a good example.

F. The elephant is the biggest four-legged animal in the world.

G. The male elephants want to stay with female ones, but they are not welcome.