问题 单项选择题 B1型题

前庭眼反射系统对变化了的刺激作出相应调整并要求视觉信号参与的现象是()。

A.疲劳现象

B.习服现象

C.适应现象

D.代偿现象

E.替代现象

答案

参考答案:C

解析:此题考查了前庭中枢的部分生理现象的特点。适应现象指中枢神经系统对前庭系统的损伤具有可塑性适应的能力,主要是改变VOR的增益、时相和方向。诱导前庭适应的信号是视网膜滑动,因此前庭适应需要视觉输入以及身体和头部运动的参与。习服现象指长期或定期反复暴露于同一特定的刺激之后机体的前庭反应逐渐减弱的现象,因为中枢系统要求习服传入的一致性。疲劳现象是指对持续刺激或反复刺激而引起前庭反应的降低或消失,刺激强度增加,疲劳程度也随之加重,刺激停止后,疲劳现象可缓慢消失。感觉替代现象是前庭代偿的一部分,是机体采用另外的一些行为策略或其他感觉来替代或弥补已经丧失的功能。

阅读理解

Peter always doesn’t know the way. His friends often laugh at him. They say he needs a map to find the bathroom in his own house. In his eyes, every street looks the same, and he doesn’t know which way to go. Sometimes he has to take a taxi home because he can’t remember the way to his house.

Peter watches a lot of films and reads a lot of books about animals. Each bird knows which way is south. Bats (蝙蝠) can fly at night and find their way with their ears. He feels embarrassed (困窘的) because all these animals have a good sense of direction. He tries to find his way with the help of stars in the sky. There is a star called the North Star, and he knows how to find it.

Of course, Peter’s friends are still laughing at him, because he can only see the North Star outside when it is sunny at night. He can’t tell the directions in the daytime or when he is inside or when it is cloudy.

小题1:Sometimes Peter has to take a taxi home because __________.

A.he is tired after shopping

B.he doesn’t know the way home

C.he likes taking the taxi

D.his friends want him to do that小题2:Bats find the way with their __________.

A.ears

B.mouths

C.noses

D.eyes小题3:What does the phrase “sense of direction” mean in Chinese?

A.幽默感

B.责任感

C.幸福感

D.方向感小题4:Peter’s friends still laugh at him because he __________.

① can’t still find his way in the daytime  

② can’t still find his way when he is inside

③ can’t still find his way when it is cloudy

④ can see the North Star outside

A.①③

B.①②

C.①②③

D.①②③④

填空题