问题 问答题

超声:定义:______.

应用方面有①______、②______、

③______、④______.

次声:定义:______.

应用方面有______、______.

答案

振动频率高于20000Hz的声音叫超声;

其应用方面有:(1)探测海里鱼群的位置

(2)探测海底深度、海中暗礁等

(3)检查、治疗人体疾病对医疗器械和食物等进行杀菌消毒

(4)超声波金属探伤仪能探测金属制品内在的缺陷

(5)用超声波处理过的种子可以缩短发芽时间,提高发芽率

振动频率低于20Hz的声音叫次声;

其应用方面有:能预报地震、海啸等.

阅读理解

Dou Kou, a Chinese boy, is called “the youngest writer in the world”. He has written three books till now.

Dou Kou was born in Jiangsu in 1994. When he was 7 months old, his parents started working in over 30 different cities, such as Xi’an and Shenzhen. This kind of life gave him things to think and write about. When he was 9 months old, he could speak and at the age of one, he could say five to six hundred words. At three, he could look up words in the dictionary. At four, his father taught him how to learn by himself. His parents like reading very much. So does he . At the age of 5, he began writing fairy tales. At the age of 6, he wrote a novel about his life in different cities with his parents. His fairy tales are all from his life. One day, he found many mice in the house. They not only ate their food but also hurt his mother’s hand. So he thought, “If we give mice the stomach of cows, they will eat grass and they will be helpful to people.” This was his first fairy tale Change stomach for Mice.

Now he studies well in a middle school. He has written his third book, the novel called Eyes of Children. He says, “I am not different from other children. I just wrote several books.”

小题1:How many books has Dou Kou written?

A.Three.

B.Four.

C.Five.

D.Six.小题2:Thanks to his         , Dou Kou could write his books.

A.mother

B.father

C.school life

D.life in different cities小题3:What does the underlined word “they” refer to(指代)?

A. Dou Kou’s parents.

B.Mice.

C.Cows.

D.Grass.小题4:When did Dou Kou begin to use a dictionary?

A.When he wrote fairy tales.

B.Before his father taught him how to learn something.

C.After he went to school.

D.After his mother taught him how to learn something.

单项选择题 A1/A2型题