问题 单项选择题

某机关20人参加百分制的普法考试,及格线为60分,20人的平均成绩为88分,及格率为95%。所有人得分均为整数,且彼此得分不同。问成绩排名第十的人最低考了多少分( )

A.88
B.89
C.90
D.91

答案

参考答案:B

解析: 要第十人分数最低,则前9人必须尽量高,分别为100,99…92,这样就有20×88-(100+99+…+92)=1760-9×96=1760-864=896(等差数列知识点的考查);其次,后面的10人分数要尽量高,才能使第10人分数尽量低,其中还要有个不及格的,则不及格的为59分。到此为止,此题转化为10人总分为896-59=837,要求第一人分数最低。837除以10取整为83,则这一串数为87,86,…79,这是9个数,还剩一个83和剩下的数字7,7可以分出6和1,分别加到83和87上即数据为89,88,86,85…79。故选B。

阅读理解

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.“Why 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

多项选择题