Unless we can completely get rid of all the poisonous food in the market, all the measures we have taken will be .A. in trouble B. in detail C. in vain D. in debt 题目和参考答案——青夏教育精英家教网—

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( ) 10. Unless we can completely get rid of all the poisonous food in the market, all the
measures we have taken will be .

A. in trouble B. in detail C. in vain D. in debt

10. C考查介词短语辨析。in trouble有麻烦;in detail 详细地;in vain徒劳地;in debt负债。句意：除非我们能完全在市场上消除有毒食物，否则我们所采取的措施都是徒劳的，

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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。

( ) 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.

( ) 5. If your knowledge can be in some way with my experience,we are sure to

succeed.

A. substituted B. acknowledged C. declined D. combined

5. Not after going on a diet for three months，Jane felt very upset. (lose)

节食三个月没有减轻体重，Jane感到非常沮丧。

一个英文网站正面向中学生征稿，请你写一篇英语稿件，介绍"中秋节"及这个节日里的主要活动。

写作要点：它是中国的传统节日之一；家人团聚；人们赏月、吃月饼，还有旅游、访友等

其他活动。

注意：1.词数120左右;

2.可以适当增加细节，以使行文连贯。参考词汇：中秋节the Mid-Autumn Festival农历lunar calendar 赏月enjoy the full moon月饼moon cake

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。

3. ，the firefighters managed to rescue the little boy from the big fire, (as )

尽管很困难，消防员还是成功地将小男孩从大火中解救了出来。

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