By the time .I will have finished reading the book. 到他回来时.我将读完这本书了. 题目和参考答案——青夏教育精英家教网—

题目内容

22. By the time ，I will have finished reading the book. (come)

到他回来时，我将读完这本书了。

22. he comes back考查一般现在时表将来的用法。在主从复合句中，主句时态为将来时，从句时态应用一般现在时表将来。在本句中，bythetime 引导的句子是从句，因此"回来"的时态应是一般现在时表将来。

练习册系列答案

1加1轻巧夺冠小专家课时练练通系列答案

相关题目

8. The teacher commanded the students the classroom before he returned. (go)

老师命令学生在他回来之前不要离开教室。

6. It was when he was in the army early rising. (form)

他正是在部队里养成了早起的习惯。

10. In response to the audience' s great demand, the play in the theatre twice a week. (put)

应观众的强烈要求，这部戏将会在这个剧院每周上演两次。

17. The subject in the general meeting of shareholders until the workers threatened a strike. (come)

直到工人威胁要罢工，这个话题才在股东大会上提了出来。

27. A Frenchman who lost his arms and legs successfully swam across the Channel，a challenge he for two years. (prepare)

一位失去了双臂和双腿的法国人成功地游过了这个海峡，完成了一个他准备了两年的挑战。

( ) 4. The photos on the wall my mother of those happy old days when a large family

lived together.

A. inform B. approve C. remind D. retell

Most people know Alexander Graham Bell invented the telephone. But not many know about another talking device (equipment) he invented just four years later，in 1880. He called the device the photophone.

"Photophone" comes form the Greek words for "light" and "sound". The photophone did not use electricity to carry sound over wires between two people. That' s what a telephone does. Instead,

the photophone used a beam of sunlight traveling through the air. With his invention, Bell could actually transmit(传递)human speech on a beam of light. To do so，he spoke close to a thin mirror that was reflecting sunlight. The vibrations(颤动)of his voice caused the mirror to vibrate，and the vibrating mirror caused the light to vibrate. The vibrating light hit a light-sensitive cell in a receiver placed some distance away. The cell changed the light patterns into electrical signals. Earphones changed the signals back into sounds.

Bell believed that his idea of talking on a beam of light would prove to be important. He often called the photophone his greatest invention. Even though the photophone depended on a source of energy that was not constant一the sun―Bell wasn' t a bit discouraged. He felt sure that people would one day talk using beams of light.

Two much more recent developments made Bell' s dream come true. In 1960 ，a scientist built the laser. A laser produces a highly concentrated beam of light. Shortly afterward, other scientists developed a new kind of optical fiber. The optical fiber is a glass thread. The new fiber could carry light beams long distances―as far as several miles.

( ) 1. According to Bell's own opinion, is his greatest invention.

A. telephone B. optical fiber C. photophone D. laser

( ) 2. What does "That" refer to in the underlined sentence?

A. Using a beam of sunlight traveling through the air.

B. Using electricity to carry sound over wires between two people.

C. Transmitting human speech on a beam of light.

D. Light and sound.

( ) 3. Which statement is true about Bell，s invention of photophone?

A. The photophone depends on a constant source of energy.

B. The photophone is based on the invention of the telephone.

C. Earphones are used to change light into sounds.

D. The laser and the optical fiber are helpful for Bell' s invention.

7. The innocent boy took the advice that he strangers. ( stare )

这位单纯的男孩接受了不要盯着陌生人看的建议。

试题分类