Ques:It is not always easy to understand inventions and new developments in science. To understand fiber optics , however, you can try an experiment. Put a drop or two of milk into the glass of water. Turn off the lights. Shine the light from your flashlight  through the top of the glass at an angle  of about 45 degrees. Put a piece of white paper against the glass when the beam of light is shining. Move the paper so you can see where the beam is coming out of the glass. You should see a spot of light. Some of the light has passed through the water and through the glass. You see it on the paper. You also see another beam going down into the glass. It is being reflected down into the glass. Next move the flashlight so that the beam is coming straighter down(30 degrees) into the water. You will see the same phenomenon: some of the light is reflected back into the glass. And some escapes out. Now move the beam of light from the flashlight slowly up until you cannot see any light escaping. This point is called the "point of total internal reflection." The word internal means "inside." All the light is staying inside the glass. There is no beam showing a bright spot on the white paper. All the light energy is inside the glass. The glass of milky water is like a strand of glass. A fiber optic tube is a bundle of long thin strands of glass, really many tubes. However, the principle  is the same: at a certain angle, all the light energy that goes into the glass fiber comes out the other end. Light is energy. Sound is energy. Radio waves and electricity are both energy. They can all be changed into light, and as light they can all travel along a glass fiber. Light travels at the rate of 186,000 miles per second. Therefore, a message can travel that fast in a glass fiber. This is the principle, or law of nature, that makes fiber optics work. Which of the following can be the best title? A) Experiment of Light Travel B) Principles of Fiber Optics C) Communication on Fiber Optics D) Theory of Light Travel

Ans:B
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Ques:Little Lopsy fluttered  into our home and our hearts one Saturday morning this summer. My husband went out to do something, and when he opened the door there was a great flutter on the ground and something came into the living room. It was clear that whatever it was was hurt. I was in a bit of a shock and didn't know what to do next. Fortunately it calmed down and tried to hide itself in a corner. I realized it was a sparrow chick . There are a few sparrow nests under the roof of our apartment, and this little fellow must have fallen out and hurt itself. It was also very young, and obviously far from ready to leave the safety of the nest. I ran to the place and found a box. Having read somewhere that one shouldn't touch a baby bird with one's hands, I picked the chick up with a hand towel and put it in the box. I placed the box outside the front door in the hope that the parents would try to feed it. They never came near it and I brought it inside. I placed the box on a table and it slept for about twenty hours. We later learned that it is quite normal for a hurt bird to sleep so much after undergoing such a hurt experience. When it finally woke up we carefully examined it for wounds, but fortunately there wasn't any. It had hurt its right wing and leg, which meant it must have landed on its right side when it fell out of the nest. We named it Lopsy. After doing some research we felt there was a chance that it might survive, but we weren't sure that it would ever be able to fly. A hurt bird doesn't stand much of a chance of survival and could fall easy pray  to cats, other animals. Was it fair to allow it to live if it meant keeping it in a cage its whole life? It was a hard decision, but we decided to give it a go.  We started off by dripping drops of water into its mouth. It was very thirsty and drank quite a bit. Next we fed it with bread soaked in water. Our household routine  soon revolved around Lopsy who needed to be fed about every three hours during the day. Fortunately we live on campus and my... The author finally decided to let the sparrow chick go because   _  . A) she knew that it would be able to fly B) it could fall easy pray to other animals C) taking care of it is too troublesome D) keeping it in a cage is against its nature

Ans:D
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Ques:Old age may not sound exciting.But recent findings offer good news for older pepole and for people worried about getting older. Researches found that people become happier and experience less worry after they reach the age of fifty.In fact,they say by the age of eighty--five,people are happier with their life than they were when they were eighteen years old.  The findings came from a survey of more than 340,000 adults in the United States.The Gallup Organization questioned them by telephone in 2008.At that time,the people were between the ages of eighteen and eighty--five.The searches asked questions about emotions like happiness,sadness and worry.They also asked about mental or emotional stress. Arthur Stone in the Department of Psychiatry and Behavioral Science at Stony Brook University in New York led the study.His team found that levels of stress were highest among adults  between the ages of twenty--two and twenty--five.The findings showed that stress levels dropped sharply after people reached their fifties.Happiness was highest among the youngest adults and those in their early seventies.The people least likely to report feeling negative emotions were those in their seventies and eighties. The study also showed that men and women had similar emotional patterns as they grew older.Hower,women at all ages reported more sadness,stress and worry than men.Researchers say they do not know why happiness increases as people get older.One theory is that,as people grow older,they grow more thankful for what they have and have better control of their emotion .They also spend less time thinking about bad experiences. The researchers also considered possible influences like having young children,being unemployed or being single.But they found that influences like these did not affect the levels of happiness and well--being related to age. When do people feel happier according to the passage? A) In their twenties B) In their fifties C) After their seventies D) When they were born

Ans:C
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Ques:A Bite of China, made by CCTV's Documentary Channel, sparked discussion not only on Chinese food, but also on locally made documentary programs. When you think of documentaries, you may think of them as long, boring programs. But documentaries can be wonderful and bring stories from the real world into our homes. With fascinating footage and stories, documentaries encourage us to think about interesting issues we wouldn't necessarily know about. So, what makes a good documentary, and what should we pay attention to when we watch one? Here, we offer a few easy strategies to help you get the most out of watching documentaries. Pay attention to the themes While watching a documentary, keep your eyes and ears peeled for the themes people talk about and what ideas they focus on. Is it meant to be informative or raise a certain emotional response? Think critically Listen to what the people in the documentary are saying and ask yourself the following questions: If you were debating with someone or introducing a new concept, would you say the things the people in the documentary are saying? Do the arguments make sense? Check the sources If you're sitting at the computer and can't think of anything to do, why not look up the points the documentary made and see if they are accurate? You could even read more about what is presented in the documentary. Who are the creators? The creators or financial backers of a film will usually be involved with how the subject matter is presented. For instance, as the documentary 2016: Obama's America was directed in large part by a conservative writer, it's not surprising that it's critical of President Obama from the beginning. Why is 2016: Obama's America mentioned in the article? A) Because the author dislikes Obama. B) Because it is a persuasive example. C) Because it is quite popular in China. D) Because it is directed by a writer.[:Z. xx. k.Com]

Ans:
B
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