I'm taking a test and have to guess the right answer to the question after the article. 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 last step is to prove_. Options: A: no beam is shown on the white paper B: no light can be noticed inside the glass C: no reflection can be seen D: no energy is wasted
D

I'm taking a test and have to guess the right answer to the question after the article. Article: The extraordinary Eastgate Building in Harare, Zimbabwe's capital city, is said to be the only one in the world to use the same cooling and heating principles as the termite mound . Architect Mick Pearce used precisely the same strategy when designing the Eastgate Building, which has no air-conditioning and almost no heating. The building--the country's largest commercial and shopping complex--uses less than 10% of the energy of a conventional building of its size. The Eastgate's owners saved $3.5 million on a $36 million building because an air-conditioning equipment didn't have to be imported. The complex is actually two buildings linked by bridges across a shady, glass-roofed atrium open to the air. Fans suck fresh air in from the atrium, blow it upstairs through hollow spaces under the floors and from there into each office through baseboard vents . As _ rises and warms, it is drawn out via ceiling vents and finally exists through forty-eight brick chimneys. During summer's cool nights, big fans blow air through the building seven times an hour to cool the empty floors. By day, smaller fans blow two changes of air an hour through the building, to circulate the air which has been in contact with the cool floors. For winter days, there are small heaters in the vents. This is all possible only because Harare is 1600 feet above sea level, has cloudless skies, little dampness and rapid temperature changes--days as warm as 31degC commonly drop to 14degC at night. "You couldn't do this in New York, with its hot summers and cold winters," Pearce said. The engineering firm of Ove Arup&Partners monitors daily temperatures. It is found that the temperature of the building has generally stayed between 23degC and 25degC, with the exception of the annual hot period just before the summer rains in October and three days in November, when a doorkeeper accidentally switched off the fans at night. And the air is fresh--far more so than in air-conditioned buildings, where up to 30% of the air is recycled. Question: Why was Eastgate cheaper to be built than a conventional building? Options: A: It was designed in a smaller size. B: No air conditioners were fixed in. C: Its heating system was less advanced. D: It used rather different building materials.
B

I'm taking a test and have to guess the right answer to the question after the article. Article: Miang My name is Miang,I come from Thailand. I would like to tell you about my favorite holiday,which is Chinese Spring Festival,taking place in January or February every year. My family is Chinese,and we celebrate this day all together,too. My aunt prepares some traditional Chinese dishes,such as duck ,chicken,fish,pork and so on. We will have a get-together to enjoy all these delicious food,especially a kind of food--"dumplings". Janine My favorite holiday is Christmas. On Christmas,we dance,play music and sing. We have great fun on that day. We eat Christmas sweets and many special foods. We decorate our house with colorful lights. I love Christmas mainly because it is Jesus' birthday! Zhenia My favorite holiday is New Year. We celebrate the New Year on the 31st of December. Father Frost comes with his granddaughter Snegoorochka on this night. He comes at night and puts his presents under the New Year Tree. We have a party and stay up until midnight to see the New Year in and the Old Year off. We cook tasty food for parties. Pat My name is Pat,and I am from Thailand. My favorite holiday is Songkran. It is a Thai New Year celebration. It takes place from the 13th to 15th of April. People pour water on each other on this holiday. It is a lot of fun. People also buy new clothes and they have big parties. Malena I am Malena,and I'm from Argentina. My favorite holiday is New Year. We celebrate with fireworks at midnight. I go to Punta del Este with my family. We usually eat Arabian food(kibbe,Lajmayin and so on). Question: On Chinese New Year's Day,Miang's aunt may cook all of the following EXCEPT _ . Options: A: duck B: dumplings C: Lajmayin D: pork
C