烤梗机输送网反两侧的护板的主要作用是保护网板的。

植物细胞有丝分裂的过程中，染色体在细胞中的位置不断发生变化。那么是什么牵引染色体的运动呢？某同学对该问题进行了实验探究。

实验假设：染色体的运动是由纺锤丝牵引的。

实验方法：破坏纺锤丝。

实验材料和用具：相差显微镜(可连续观察活细胞一个分裂期的染色体变化) 、洋葱、盖玻片、载玻片、吸水纸、滴管、广口瓶、清水、一定浓度的秋水仙素溶液等。

方法步骤：

a．培养洋葱根尖。

b．切取根尖2～3mm，并对它进行解离、漂洗和染色。

c．将洋葱根尖制成临时装片，并滴加一定浓度的秋水仙素溶液，使根尖处于秋水仙素溶液中，在相差显微镜下用一个分裂期时间观察染色体的运动情况。

(1)该同学设计的实验步骤有两处明显的错误，请指出错误所在。______________。

(2)实验中选用秋水仙素破坏纺锤丝，你认为是否可行？试说明理由。_____________。

(3) 根据该同学的实验设计请预测实验结果及结论：

①．_______________________；

②．_______________________。

写句子。

1、人们都爱秋天，爱她的天高气爽，爱她的云淡日丽，爱她的香飘四野。   

______________________________，_________________________。 

2、如果没有想像，思维就像花儿失去了营养；如果没有想像，思维就像鸟儿折断了翅膀；如果没有想像，__________。     

3、适应是什么？适应是泰山悬崖上迎风劲舞的青松，是寒冬腊月里傲雪盛开的腊梅，是点闪雷鸣中高傲飞翔的海燕。    

友谊是什么？________________________________。      

4、友情，是人生一笔受益非浅的储蓄。这储蓄，是患难中的倾情相助，是_____，是_____，是错误道路上的忠言逆耳。         

5、如《出师表》中关键句：诸葛亮‘鞠躬尽 瘁，死而后已’，这是他许身社稷的誓言，也是他作为两朝辅臣忠心报国的见证。    

鲁迅先生：“横眉冷对千夫指，俯首甘为孺子牛。”这是_________，也是他作为_____________________。       

李白：“天生我材必有用，千金散尽还复来。”这是他_________，也是他作为_______________________。 

李煜：“问君能有几多愁，恰似一江春水向东流。”这是他对强烈的亡国之痛的描述，也是他作为一个薄命君王的悲苦境遇的反映。

陆游：“王师北定中原日，家祭无忘告乃翁。”这是他临终的遗嘱，也是他作为一位爱国诗人终生追求未遂的梦想。

降钙素对钙磷代谢的影响是（）。

A．使尿钙、尿磷增加；血钙、血磷降低

B．使尿钙、尿磷减少；血钙、血磷升高

C．使尿钙减少，尿磷升高

D．促进溶骨作用

E．使血钙减少，血磷升高

Many people think of the brain as a mystery.They don't know much about intelligence and how it works.When they do think about what intelligence is，many people believe that a person is born smart，average，or dumb—and stays that way in the whole life.But new research shows that the brain is more like a muscle—it changes and gets stronger when you use it.And scientists have been able to show just how the brain grows and gets stronger when you learn.

Everyone knows that when you lift weights，your muscles get bigger and you get stronger.A person who can't lift 20 pounds when he/she starts exercising can get strong enough to lift 100 pounds after working out for a long time.That's because the muscles become larger and stronger with exercise.And when you stop exercising，the muscles shrink and you get weaker.That's why people say “Use it or lose it！”

But most people don't know that when they practice and learn new things，parts of their brain change and get larger a lot like muscles do when they exercise. Inside the cortex(皮层)of the brain are billions of tiny nerve cells，called neurons. The nerve cells have branches connecting them to other cells in a complicated network. Communication between these brain cells is what allows us to think and solve problems. When you learn new things，these tiny connections in the brain actually multiply and get stronger.The more you challenge your mind to learn，the more your brain cells grow.Then，things that you once found very hard or even impossible to do—like speaking a foreign language or doing algebra(代数)—seem to become easy after learning them for a period of time.The result is a stronger，smarter brain.

Scientists started thinking that the human brain could develop and change when they studied animals'brains.They found out that animals that lived in a challenging environment were more perspicacious—they were better at solving problems and learning new things.

小题1:According to the first paragraph，________.

A．the function of our brain is like that of the muscle

B．until now it's impossible to explain the brain's mystery

C．many people believe one's intelligence is naturally determined

D．one's brain grows stronger as the age increases小题2:Training muscles is compared to ________.

A．using the brain

B．connecting things in your brain

C．lifting weights

D．doing research about the brain小题3:What does the underlined word“perspicacious”in the last paragraph probably mean?

A．Strong.

B．Smart.

C．Popular.

D．Active.小题4:The following paragraph will most probably talk about ________.

A．the differences between animals'brains and humans'brains

B．the relation between human brains and muscles

C．scientists' findings about animals' brains

D．how to make your brain smarter through selfdevelopment

下列就代理制度中有关民事责任的规定，说法正确的有( )。

A．委托书授权不明的，被代理人应向第三人承担民事责任，代理人负连带责任

B．代理人不履行职责给被代理人造成损害的，代理人承担民事责任

C．代理人和第三人串通，损害被代理人的利益的，由代理人单独承担民事责任

D．被代理人知道代理人的代理行为违法不表示反对的，被代理人和代理人负连带责任

E．第三人明知代理人超越代理权限仍与其订立合同，损害被代理人的利益的，由被代理人和代理人负连带责任