Scientists from South Korea are trying to convert（轉(zhuǎn)化）sound waves into electricity. The research could lead to charging a cell phone from a conversation or providing energy to the nation’s electricity system generated（產(chǎn)生）by the noise during rash-hour traffic.

“Just as speakers transform electrical signals into sound, the opposite process —turning sound into a source of electrical power — is possible,” said Young Jun Park and Sang-Woo Kim, the joint authors of a new article in the journal Advanced Materials.

Harvesting energy from phone calls and passing cars is based on materials known as piezoelectrics. When bent, piezoelectric materials turn that mechanical energy into electricity. Lots of materials are piezoelectric: cane sugar, quartz （石英）and even dried bone which could create an electrical charge when stressed. For decades, scientists have pumped electricity into piezoelectric materials for use in environmental sensors, speakers and other devices.

Over the past few years, however, scientists have made dramatic advances in getting electricity out of piezoelectric devices. In an experiment, by using sound waves, which at 100 decibels（分貝）were not quite as loud as a rock concert （a normal conversation is about 60-70 decibels）, the South Korean scientists produced a mild electrical current of about 50 millivolts（毫伏）. The average cell phone requires a few volts to function, several times the power this technology can currently produce.

“But the real question is whether there is enough surrounding noise to act as a power source as for a cell phone,” said McAlpine, a leading scientist. A consumer probably wouldn’t want to attend a rock concert or stand next to a passing train to charge his cell phone. The South Korean scientists agree but they expect to get a higher power output as they continue their work.

1.According to the two South Korean scientists, ________.

A．sound waves can travel faster than electricity

B．new materials can send cell phone signals better

C．using cell phones adds to heavy traffic in rush hour

D．electricity and sound can be transformed into each other

2.We know from the passage that piezoelectric materials ________.

A．can produce electricity when stressed

B．a(chǎn)re good at changing electricity into sound

C．can reduce the noise of passing cars

D．have been widely used in phones and cars

3.It can be inferred from the South Korean scientists’ experiment that ________.

A．it is hard to change sound into electricity under current conditions

B．it is impossible to make use of loud sound

C．the technology has a long way to go to have a practical use

D．the technology can power cell phones easily

4.What McAlpine doubts about the technology is ________.

A．the noise pollution                      B．the sound resource

C．the cost of piezoelectrics                 D．the safety of devices

Charlie Chaplin was the first international star of the modern era(年代). He was especially beloved for his Little Tramp 32. He was the first screen artist to write, 33 and perform in his own films; in fact, 34 Charlie Chaplin even wrote the music for his movies. He was also the first artist to use his work to pass a 35of equality and justice for all —36for the "little guy". Charlie Chaplin's career and life made 37 the first global icon (偶像); his too-small hat, his too large shoes and his trademark moustache were instantly 38 by audiences from Chicago to China, from Iowa City to India. And they 39 are today. All of these make Charlie Chaplin the first citizen of our global village.
Chaplin, a native of London, was born in40 on April 16, 1889 to music hall performers. Chaplin only saw his 41twice until the age of seven. The man 42 him and his mother about a year after Chaplin was 43. During Chaplin's earliest years, his mother was a(n) 44and performer. Then her voice gave out, her stage career 45, and she began actively 46Church of England services. At the age of 47, Chaplin's mother was considered as the insane and sent to Cane Hill lunatic asylum (瘋?cè)嗽?, and the 48 sent Charlie and his brother to live with his father, 49 had by then stopped all payments of child support.
Charlie Chaplin lived with his father only a short time 50 his mother was released from the lunatic asylum and then 51Charlie and his brother, to live with her once again.

During my review for the medical boards, I gained 101 pounds in four months and promised to exercise when all of this was over. I successfully passed the medical boards and now I have to face the music.

One morning, I woke up and decided to go to a park to start working out. I got out of bed, washed my face, brushed my teeth and put on my sports shoes. Then I headed for the park. While going there, I decided to set a goal for myself, that, I had to finish 10 rounds before I went home.

Upon reaching the park, I joined the people in walking around the park. I was enjoying every step, breathing in fresh air, appreciating the green grass and looking at the dried leaves falling from the trees while listening to my iPod.

On my 5th round, I felt tired, hungry and thirsty. I thought of giving it up, going home and sleeping again. As the idea battled in my mind, I was reminded about the goal I had set just a while ago. I kept on walking and as I looked around, I saw myself in the midst of men and women much older than me who continued to move on. Some even suffered from a stroke(中風(fēng)) that had difficulty walking, some took on small steps with a cane on hand and some took on pauses before they continued their walk but still they kept on walking.

Suddenly I realized that each of us has set our own goals in our lives, such as reaching a dream, building up a career, correcting a past mistake or starting a business. The process won’t be easy. We may encounter(遇到) a lot of difficulties and obstacles that may push us to just give up.

Amazed by the men and women whom I walked with that morning, I finished my goal in the end.

Let us be inspired with the people around us who experience the same or even a greater amount of difficulty but still don’t give up and continue until they reach their goals and now are savoring(享受) their success.

1.What does the underlined sentence in Paragraph 1 mean?

A．Now I don’t feel like listening to my iPod.

B．Now I have to care more about my health.

C．Now I have to take physical exercise.

D．Now it is time for me to listen to music.

2.What did the author do on his way to the park?

A．He worked out a plan for his future.

B．He reflected on the causes of his overweight.

C．He decided to finish 10 rounds that morning.

D．He planned to take exercises every day.

3.When the author was walking the 5th round _____.

A．he didn’t want to continue walking

B．he found it easy to keep his promise

C．he was enjoying walking in the park

D．he was too tired to keep up with others

4.What inspired the author to finish 10 rounds that morning?

A．The goal he kept in mind.                 B．His strong will to keep fit.

C．The good figure he wanted.                D．The people exercising in the park.

One afternoon in January in 1998, Susan Sharp, 43, and her 8-year-old son David, were walking across an icy square,? ? ? ? Susan's cane(手杖) slipped on the ice. Her face ? ? ? first into the mud. David ? ? ? her mother's side, “Are you all right, Mom” ? ? , Susan pulled herself up, “I'm okay, Honey,” she said.

Susan was falling more ? since she had trouble walking. Every inch of ice was a ? ? danger for her. “I wish I could do something,” the boy thought. David, too, was having ? ? ? of his own. The boy had a speech problem, so at school he talked ?? ? .

　　One day, David's teacher announced? a ? ? ? homework. "Each of you is going to come up with an ? ? ? ," she said. This was for "INVENT AMERICA", a national competition to encourage creativity in children.

　　An idea ? ? ? David one evening. If only his mother's cane didn't slip on the ice. “What if I ? ? ? your cane to a nail coming out of the bottom” he asked his mother.

　　“ ? ? ? the sharp end would scratch(劃破) floors,” Susan said.

　　“No, Mom, I ? ? make it like a ball-point pen. You take your hand off? the button and the ? ? ? returns back up.” Hours later the cane was finished. David and his father ? ? ? as Susan used it to walk 50 feet about the ? ? ? . Happily Susan cried out, “It ? ? ? !”

In July 1999, David was? ? ? national winner for the "INVENT AMERICA". David began to make public appearance. Thus he was forced to communicate ? ? .Today, David is nearly free of his speech problem, and his cane is becoming well accepted.

1.A. Where??? ?? B.while? ?????? C.when?? ???? D. then

2.A. fell????????????? ???? ?? B. touched????????????? ??? C. lay????????????? ?????? D. dropped

3.A. stood by????????????? ??? B. rushed to????????????? ??? C. looked at????????????? ?? D. ran around

4.A. Firmly????????????? ??? B. Easily????? ????????????? C. Quickly????????????? ??? D. Shakily

5.A. slowly????????????? ??? B. frequently????????????? ??? C. freely????????????? ??????? D. heavily

6.A. hiding????????????? ??? B. certainly????????????? ??? C. possible????????????? ??? D. waiting

7.A. method????????????? ??? B. disease????????????? ??? C. trouble????????????? ??????? D. hope

8.A. few????????????? ??????? B. little????????????? ??????? C. much????????????? ??????? D. more

9.A. useful????????????? ??? B. strange????????????? ??? C. common????????????? ??? D. special

10.A. appearance????????????? B. invention????????????? ??? C. experience????????????? ??? D. experiment

11.A. reminded????????????? B. encouraged?? ????????????? C. occurred????????????? ??? D. hit

12.A. fastened????????????? B. stuck????????????? ??????? C. fixed????????????? ??????? D. tied

13.A. So????????????? ??? B. And????????????? ??????? C. For????????????? ??????? D. But

14.A. might????????????? ??? B. would????????????? ??????? C. did????????????? ??????? D. need

15.A. pen????????????? ??? B. hand????????????? ??????? C. cane????????????? ??????? D. nail

16.A. watched????????????? B. supported????????????? ??? C. noticed????????????? ??? D. helped

17.A. street????????????? ??? B. ice????????????? ??????? C. yard????????????? ????? ? D. square

18.A. works????????????? ??? B. operates????????????? ??? C. succeeds????????????? ??? D. helps

19.A. declared????????????? B. received????????????? ??? C. won????????????? ??????? D. praised

20.A. more slowly????????????? B. more carefully????????????? C. more clearly????????????? D. faster

　  The old man walked with a cane(拐杖) slowly into the restaurant. His poor jacket, patched (打補(bǔ)丁的) trousers, and worn-out shoes made him stand out from the usual Saturday morning breakfast crowd. Unforgettable were his pale blue eyes that were bright like diamonds, large rosy cheeks, and thin lips held in a smile.

He walked toward a table by the window. A young waitress watched him and ran over to him, saying, “Here, Sir. Let me give you a hand with that chair.”

Without a word, he smiled and nodded a thank you. She pulled the chair away from the table. Steadying(穩(wěn)住) him with one arm, she helped him move in front of the chair, and get comfortably seated. Then she pushed the table up close to him, and leaned his cane against the table where he could reach it.

In a soft, clear voice he said, “Thank you, Miss.”

“You are welcome, Sir.” She replied. “My name is Mary. I’ll be back in a moment. If you need anything, just wave at me!”

After he had finished a hearty meal of pancakes, bacon, and hot lemon tea, Mary brought him the change, helping him up from his chair and out from behind the table. She handed him his cane, and walked with him to the front door. Holding the door open for him, she said, “Come back and see us, Sir!”

He nodded a thank you and said softly with a smile, “You are very kind!”

When Mary went to clean his table, she was surprised. Under his plate she found a business card and a note written on the napkin, under which was a $100 bill.

The note on the napkin read, “Dear Mary, I respect you very much, and you respect yourself, too. It shows by the way you treat others. You have found the secret of happiness. Your kind gestures will shine through those who meet you.”

The man she had served was the owner of the restaurant. This was the first time that she, or any of his employees, had seen him in person(親自).

71. The relationship between the old man and Mary was ______. 

A. father and daughter                B. employer and employee

C. waiter and customer                         D. uncle and nephew

72. Based on the passage, all of the following words can be used to describe Mary except _____.

A. kind       B. considerate       C. helpful       D. calm

73. Mary ran over to the old man because _______.

A. the old man was the boss of the restaurant

B. she saw the old man had some difficulty moving and taking a seat

C. she was worried that the old man might cause trouble to the restaurant

D. the old man had asked her to wait on him

74. The man came to the restaurant _______.

A. to have breakfast

B. to see his employees

C. to find out how his restaurant was working

D. to see how Mary served customers

75. The words the man left on the napkin indicated that _______.

A. respecting others means respecting oneself

B. serving others is a respectable job

C. Mary would get a rise as a result of her kindness

D. Mary’s kind service would bring in more money for her