问题 填空题

如图(a)所示是一种超声波测速仪的工作原理图,固定的盒子B内有超声波发射装置,工作时该装置每隔Δt向被测物体发出一个短暂的超声波脉冲,脉冲被运动物体反射后又被B盒接收。图(b)是某次测量中连续两次发射的超声波的s-t图像,若物体正在做匀速直线运动,则运动物体正在___________(选填“靠近”或“远离”)B盒,速度大小为_________。(请用题目和图中的符号表示)

答案

远离,

题目分析:

从图像中可看出脉冲被运动物体反射后B盒接受的时间间隔变长,所以物体正在远离B盒,

物体通过的位移为时,所用时间为所以物体的平均速度为

点评:本题是实际应用问题,考查应用物理知识分析、理解现代科技装置原理的能力.

选择题
阅读理解

“The Lord of the Rings”, one of the best sellers in the new millennium(千年), was made up of three parts—“The Fellow Ship of the Ring”, “Two Towers”, and “The Return of the King”. Millions upon millions of people have read it in over 25 different languages, but fewer know about the author and the history of the composition of the creative masterwork.

John Ronald Refuel Tolkien was born in South Africa in 1892. His parents died when he was a child. Living in England with his aunt, Tolkien and his cousins made up play languages, a hobby that led to Tolkien’s becoming skilled in Welsh, Greek, Gothic, Old Norse and Anglo—Saxon.

After graduating from Oxford, Tolkien served in World War I. In 1917, while recovering from trench fever he began composing the mythology for The Rings. As a professor of Anglo-Saxon in the 1930s at Oxford, Tolkien was part of an informal discussion group called the Inklings, which included several writers. The group was soon 1istening to chapters of Tolkien’s imaginative work “The Hobbit”.

Hobbit was a name Tolkien created for people that could best be described as half-sized members of the English rural(乡村的)class. Hobbits live in hillside holes. One of them,Bilbo Baggins, looks for treasures with a group of dwarves(侏儒). On the way, he meets the twisted, pitiful creature Gollum, from whom he sees a golden ring that makes the holder invisible.

One of Tolkien’s students persuaded her employer, publisher Allen & Unwind, to look at a draft (草稿). The chairman of the firm, Stanley Unwind, thought that the best judge for a Children’s book would be his ten-year-old son. The boy earned a shilling for reporting back that the adventure was exciting, and “The Hobbit” was published in 1937.

It sold so well that Unwind asked for a continuation. Over a dozen years later, in 1954, Tolkien produced “The Lord of the Rings”, a series of books so creative that they hold readers both new and old -- after their publication.

小题1:What can we learn from the text?

A.“The Lord of the Rings” didn't sell well in the last millennium.

B.People know better about Tolkien himself than about his works.

C.Tolkien was quite familiar with Old English.

D.Tolkien knew very well about different kinds of local languages in Africa.小题2:What can we learn about "Hobbit" that Tolkien created in his works?

A.Hobbit was a race living in English downtown areas.

B.Hobbit was a local people who were very tall and strong.

C.Hobbit was a social group of people who lived in old castles.

D.Hobbit was a group of people who were mostly dwarves.小题3: Which of the following helped most in making “The Hobbit” published?

A.One of Tolkien's students.

B.Stanley Unwind's son.

C.Allen & Unwind.

D.Bilbo Baggins.小题4:What is mainly discussed in the text?

A.“The Lord of the Rings” and its writer.

B.A completely new masterwork in the new millennium.

C.A famous professor at Oxford University.

D.The power of the magic ring.小题5: Which of the following shows the right order of Mr. Tolkien's life experience?

a. He had his “The Hobbit” published.

b. He became a member of the Inklings.

c. He served in World War I.

d. He became an undergraduate at Oxford.

e. His work “The Lord of the Rings” came to the world.

f. He moved to England to live with his aunt.

A.f-d-b-c-a-e

B.f-d-c-b-a-e

C.f-c-d-b-e-a

D.d-f-c-a-b-e