Mr. Green and his wife had a dog. When they went out, they always left the dog inside the house. One evening they wanted to go to the cinema, so they left the dog in the house and locked the door and their garden gate. They went off in their car.
When the film was finished, they went home. They opened the gate and put the car away. When they came to the front door, they found that the glass in the door was broken. The door was not locked and it was open. A robber! They went in and quickly looked in all the rooms to see if the robber had taken their things. However, everything was in the right place and nothing at all was missing.
The dog was sleeping in the sitting-room. The wife was angry with the dog.“Wh
y didn’t you guard(保卫)the house?”she said. The dog was pleased to see Mr. and Mrs. Green. It began to wag(摇)its tail and then it went to a comer of the room and picked up something in its mouth. It went to the wife and dropped the thing at her feet. When she went to pick it up, she was very surprised. Can you guess what the dog’s present was ?It was a man’s finger!
The end 
of the story is this. Mr. Green telephoned the police and told them everything. Three days later the police caught the robber. They found him easily.
小题1:That evening Mr. Green and his wife __________.
A．took their dog to see a film
B．left the dog alone at home
C．went home before the film was finished
D．locked the door and could not open it小题2:The robber stole(偷)__________.
A．everything from the house
B．something expensive from the house
C．nothing from the house
D．a car from the house小题3:Why was the woman angry with the dog? _________
A．Because she thought it had made the room dirty.
B．Because she thought it had broken the glass.
C．Because it wouldn’t go to the cinema with her.
D．Because she thought it hadn’t guarded the house.小题4:The robber was caught easily because __________.
A．the police knew him
B．the police happened to meet him
C．Mr. Green know where he lived
D．he had one of his fingers小题5:Mr. Green and his wife would _________.
A．like their dog more than before
B．drive the dog away from their home
C．let the dog bring home more presents
D．ask the police to take the dog away
小题1:B
小题1:C
小题1:D
小题1:B
小题1:A
【主旨大意】本文讲述了一个聪明的小狗的故事，它勇敢地咬下了贼的手指，帮助警察快速地捉到盗贼。
小题1:细节理解题 根据第一段的第三句“One evening they wanted to go to the cinema, so they left the dog in the house and Jacked the door and their garden gate.”可知。
小题1:细节理解题 根据第二段的最后一句“However, everything was in the right place and nothing at all was missing.”可知。
小题1: 细节理解题 根据第二段的第三句“Why didn't you guard the house?”可知。
小题1: 推断理解题 根据第三段的最后两句“Can you guess what the dog's present was? It was s man's finger.”可知因为贼的手指被咬下来了，所以很容易找到。
小题1: 推断理解题 根据文章描述的小
狗成为捉贼的英雄，可知主人会更加喜欢它。
．试证：存在ξ∈(0，π)，使f’(ξ)=0．