问题 单项选择题

右侧枕叶皮层损伤,引起的视觉障碍是()

A.右眼全盲

B.左眼全盲

C.右眼颞侧、左眼鼻侧偏盲

D.左眼颞侧、右眼鼻侧偏盲

E.左眼和右眼颞侧视力缺损

答案

参考答案:C

解析:在眼球视网膜内的视锥细胞和视杆细胞为光感受器细胞。双极细胞为第1级神经元。节细胞为第2级神经元,其轴突在视神经盘处集合成视神经。视神经经视神经管入颅腔,形成视交叉后,延为视束。在视交叉中,来自两眼视网膜鼻侧半的纤维交叉,交叉后加入对侧视束;来自视网膜颞侧半的纤维不交叉,进入同侧视束。因此,左侧视束内含有来自两眼视网膜左侧半的纤维,右侧视束内含有来自两眼视网膜右侧半的纤维。视束绕大脑脚向后,主要终止于外侧膝状体。第3级神经元胞体在外侧膝状体内,由外侧膝状体核发出纤维组成视辐射opticradiation,经内囊后肢投射到端脑距状沟两侧的视区(纹区),产生视觉。

阅读理解

Everyone has got two personalities(性格)-the one that is shown to the world and the other that is secret and real. You don’t show your secret personality when you’re awake because you can control your behavior, but when you’re asleep, your sleeping position shows the real you. In a normal night, of course, people frequently change their positions. The important position is the one that you go to sleep in.

If you go to sleep on your back, you’re a very open person. You normally trust people and you are easily influenced by fashion or new ideas. You don’t like to displease people. So you never express your real feelings. You’re quite shy and you aren’t quite sure of yourself.

If you sleep on your stomach, you are a rather secretive person. You worry a lot and you’re always easily upset. You always stick to your own opinions or judgment, but you don’t raise your hopes too much. You usually live for today not tomorrow. This means that you enjoy having a good time.

If you sleep curled up(蜷缩), you are probably a very nervous person. You have a low opinion of yourself and so you’re often defensive. You’re shy and you don’t normally like meeting people. You prefer to be on your own. You’re easily hurt.

If you sleep on your side, you have usually got a well—balanced(平衡的) personality. You know your strengths and weakness. You’re usually careful. You believe in yourself. You sometimes feel anxious, but you don’t often get sad. You always say what you think even if it makes people rather angry

小题1:You may find the passage in       .

A. a science magazine            B A guide book

C. a sports newspaper            D. a story book

小题2:When does the sleeping position best show your secret personality?

A.In the daytime

B.At the beginning of sleep

C.At night

D.During the deep sleep小题3:Tina hardly tells her secrets to her friends. She probably goes to sleep       .

A.on curled up

B.on her stomach

C.on her back

D.on her side小题4:What does the word “defensive” mean in the passage?

A.易怒的

B.攻击性的

C.外向的

D.有戒心的小题5:What does the passage tell us?

Sleeping on your side is the best way of sleeping

Changing positions will cause sleeping problems.

Sleeping positions show people’s secret personalities.

Enough sleep makes people look better and healthier.

问答题