问题 解答题

如图所示的是神经元模式图,请据图回答问题:

(1)神经元是构成______系统的结构和功能的基本单位.

(2)神经元的基本结构包括[B]细胞体和______两部分.后者又包括[A]树突和[C]______两种.

(3)神经纤维末端的细小分枝叫[D]______,分布在全身各处.

答案

如图,神经元是构成神经系统结构和功能的基本单位.其基本结构包括B细胞体和突起两部分.神经元的突起一般包括一条长而分支少的C轴突和数条短而呈树枝状分支的A树突,C轴突以及套在外面的髓鞘叫神经纤维,神经纤维末端的细小分支叫D神经末梢,D神经末梢分布在全身各处.神经元的功能是神经元受到刺激后能产生兴奋,并能把兴奋传导到其它的神经元,神经元的细胞体主要集中在脑和脊髓里,神经元的突起主要集中在周围神经系统里.

故答案为:(1)神经

(2)突起;轴突

(3)神经末梢

阅读理解

阅读理解。

     A forest fire burned 55 square kilometers was finally brought under control on Wednesday morning.

The fire started on Sunday in Black Bear State Park and quickly spread to nearby areas.

     On Monday, police evacuated (疏散) the small town of Lawson and ordered the people to leave

their homes. The fire destroyed 20 homes in the area and caused heavy damage to 40 others. Nobody

was hurt. Officials said the damage to homes and cars was between $I million and 2 million. The

government declared the town a disaster (灾难) area.

    The fire spread quickly in the hot, dry weather. Fire fighting was difficult because of strong winds.

Firemen from 55 fire departments in the state joined the National Fire Service to put out the fire. Some

kept fighting for 24 hours. Fire engines and helicopters dropped water onto the fire. In order to control

the fire, firemen cleared a way around the fire. Police closed King road to traffic on Tuesday because

of the heavy smoke. Thousands of tourists had to drive an hour north to Queen road to pass the fire

area.

    Some people did not follow the police's order. Paul Grayson sent his wife and two children to safety,

but he stayed. As the fire came within 50 feet of his house, he started thinking," Am I foolish? Did I stay

here too long, just for a house?"

1. When and where did the forest fire start?

    The fire started ______

2. What did the police order the people to do?

     The police ordered the people to ______.

3. How did the firemen drop water onto the fire?

    They ______ to drop water onto the fire.

4. How long did the tourists have to drive north to Queen road to pass the fire area?

                                                                              

5. What kind of person do you think Paul Grayson was? 

                                                                            

选择题