单项选择题
1、 微分方程y"-4y=0的特征根为（　　）
A． 0，4
B． -2，2
C． -2，4
D． 2，4

2、王某和张某签订了一份棉花买卖合同，约定王英卖给张某棉花5吨。但后来张某下落不明，王某难以履行债务，遂将棉花提存。棉花提存后，一日遭遇雷击烧毁，其损失应由
A．张某承担
B．王某承担
C．张某和王某共同承担
D．提存机关承担

3、根据以下资料，回答题。 　　As one approaches some crossroads, one comes to a sign which says that drivers have to stop when they come to the main road ahead．At other crossroads, drivers have to go slow, but they do not actually have to stop (unless, of course, there is something coming along the main road); and at still others, they do not have either to stop or to go slow, because they are themselves on the main road.
　　Mr．Williams, who was always a very careful driver, was driving home from work one evening when he came to a crossroads．It had a "Slow" sign, so he slowed down when he came to the main road, looked both ways to see that nothing was coming, and then drove across without stopping completely.
　　At once he heard a police whistle, so he pulled in to the side of the road and stopped．A policeman walked over to him with a notebook and pencil in his hand and said, "You didn't stop at the crossing."
　　"But the sign there doesn't say 'Stop'," answered Mr Williams．"It just says ‘Slow’, and 1 did go slow."
　　The policeman looked around him, and a look of surprise came over his face．Then he put his notebook and pencil away, scratched his head and said, "Well, I'll be blowed! I am in the wrong street!"
At a crossroads, you reduce your car's speed when
A． there is s stop sign
B． there is a slow sign
C． you are on the main road
D． you are on the crossroad

4、 A. friend
B. legal      
C. feature   
D. receive

5、It is quite necessary for a teacher to have good manners and__________ knowledge．
A．extensive
B．expensive
C．intensive
D．expressive

6、Daniel is a model student. He works very hard and is _________to his teachers.
A．respective 
B．respectful 
C．respectable 
D．respecting

填空题
7、



8、 土壤是指地球陆地表面具有肥力且能__________的疏松层。


简答题
9、

10、小说的主题是什么?

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