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Read the following article and select the best answer. Article: 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. Question: The purpose of the experiment is to tell us_. - how fast light travels - how fiber optics works - how light travels in a glass of water - how fiber optics helps mankind
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how fiber optics works

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Read the following article and select the best answer. Article: The businessman was deep in debt and could see no way out. Creditors were closing in on him. Suppliers were demanding payment. He sat on the park bench, head in hands, wondering if anything could save his company from bankruptcy . Suddenly an old man appeared before him. "I can see that something is troubling you." he said. After listening to the businessman, the old man said: "I believe I can help you." He asked the man his name, wrote out a check , and pushed it into his hand saying: "Take this money. Meet me here exactly one year from today, and you can pay me back at that time." Then he turned and disappeared as quickly as he had come. The businessman saw in his hand a check for $500,000, signed by John D. Rockefeller, then one of the richest men in the world! "I can settle all my debts in a moment!" he realized. But instead, the man decided to put the uncashed check in his safe, just knowing it would give him the strength to work out a way to save his business. With renewed optimism, he made better deals and extended terms of payment. He closed several big deals. Within a few months, he was out of debt and making money once again. Exactly one year later, he returned to the park with the uncashed check. At the agreed-upon time, the old man appeared. But just as the businessman was about to hand back the check and share his success story, a nurse came running up and grabbed the old man. "I'm so glad I caught him!" she cried. "I hope he hasn't been bothering you. He's always escaping from the rest home and telling people he's John D. Rockefeller." And she led the old man away by the arm. The businessman stood there, still and shocked. All year long he'd been wheeling and dealing, buying and selling, believing that he had half a million dollars behind him. Suddenly he realized that it wasn't the money, real or imagined, that had turned his life around. It was his newfound self-confidence that had given him the power to achieve anything he wanted to. Question: The businessman must have been _ after he received the check. - calm - relieved - annoyed - worried
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relieved

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Read the following article and select the best answer. Article: He met her at the party. She was so outstanding, with many boys around her, while he was so normal, with nobody paying attention to him. At the end of the party, he invited her to have coffee with him. She was surprised, but due to being polite, she agreed. They sat in a nice coffee shop. He was too nervous to say anything, and she felt uncomfortable, thinking, "Please let me go home." Suddenly he asked the waiter, "Would you please give me some salt? I'd like to put it in my coffee." Everybody stared at him---so strange! His face turned red, but, still, he put the salt in his coffee and drank it. She asked him curiously, "Why do you have this hobby?" He replied, "When I was a little boy, I lived near the sea. I liked playing in the sea, and I could feel the taste of the sea, just like the taste of the salty coffee. Now every time I have the salty coffee, I always think of my childhood. I miss my hometown so much. I miss my parents who are still living there." While saying that, tears filled his eyes. She was deeply touched. That's his true feeling, from the bottom of his heart. A man who can tell about his homesickness must be a man who loves home, cares about home, and has a good sense of responsibility. Then she also started to speak, about her faraway hometown, her childhood, her family. That was a really nice talk, also a beautiful beginning of their story. They continued to date. She found that actually he was a man who meets all her demands: he was kind-hearted, warm and careful. He was such a good person but ! Thanks to his salty coffee! Then the story was just like every beautiful love story, the princess married the prince, then they were living a happy life...And, every time she made coffee for him, she put some salt in the coffee. After 40 years, he passed away, leaving her a letter which said, "My dearest, please forgive my whole-life lie. This was the only lie I said to you ---the salty coffee." "Remember the first time we dated? I was so nervous at that time. Actually I wanted some sugar, but I... Question: What does the write mean by saying "she almost missed him"? - She meant to leave him on their first date. - She thought of him every now and then. - She nearly misunderstood his explanation. - She could hardly believe this simple fact.
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She meant to leave him on their first date.