I'm taking a test and have to guess the right answer to the question after the article. Article: You stare at waterfall for a minute or two, and then shift your gaze to its surroundings. What you now see appears to drift upward. These optical illusions occur because the brain is constantly matching its model of reality to signals from the body's sensors and interpreting what must be happening--that your brain must have moved, not the other; that downward motions is now normal, so a change from it must now be perceived as upward motion. The sensors that make this magic are of two kinds. Each eye contains about 120 million rods , which provide somewhat blurry black and white vision. These are the windows of night vision; once adapted to the dark, they can detect a candle burning ten miles away. Color vision in each eye comes from six to seven million structures called cones . Under ideal conditions, every cone can "see" the entire rainbow spectrum of visible color1s, but one type of cone is most sensitive to red, another to green, a third to blue. Rods and cones send their messages pulsing an average 20 to 25 times per second along the optic nerve. We see an image for a fraction of a second longer than it actually appears. In movies, reels of still photographs are projected onto screens at 24 frames per second, tricking our eyes into seeing a continuous moving picture. Like apparent motion, color1 vision is also subject to unusual effects. When day gives way to night, twilight brings what the poet T.S. Eliot called "the violet hour." A light levels fall, the rods become progressively less responsive. Rods are most sensitive to the shorter wavelengths of blue and green, and they impart a strange vividness to the garden's blue flowers. However, look at a white shirt during the reddish light of sunset, and you'll still see it in its "true" color1--white, not red. Our eyes are constantly comparing an object against its surroundings. They therefore observe the effect of a shift in the color1 of illuminating on both, and adjust accordingly. The eyes can distinguish several million graduations of light and shade... Question: Visual illusions often take place when the image of reality is _ . Options: A: matched to six to seven million structures called cones. B: confused in the body's sensors of both rods and cones. C: interpreted in the brain as what must be the case. D: signaled by about 120 million rods in the eye.
C
(Question)
I'm taking a test and have to guess the right answer to the question after the article. Article: With petroleum reserves decreasing,the search is on to replace gas with a cleaner,greener alternative.Though much eco-talk has centered on biofuels from corn and soybeans,the biofuel that looks more likely to replace petroleum comes from a most unlikely source:algae . Algae,like corn,soybeans,and other crops,grow via photosynthesis and can be processed into fuel oil.However,they _ 30 times more energy than land crops such as soybeans,according to the U.S.Department of Energy.Many algae species also can grow in saltwater and polluted water-while corn and soy require arable land and fresh water that will be in short supply as the world's population balloons. "If you replaced all the diesel in the U.S.with soy biodiesel,it would take half the land mass of the U.S.to grow those soybeans,"says Matt Caspari,chief executive of Aurora Biofuels,a Berkeley,Calif.-based private firm that specializes in algae oil technology.On the other hand,the Energy Department says that if algae fuel replaced all the petroleum fuel in the United States,it would require 15,000 square miles,which is a few thousand miles larger that Maryland (12,407 square miles),the 42nd state in land area. Another bonus:Because algae can be grown just about anywhere in a closed space,they 're being tested at several power plants across the nation as a carbon absorber.Smokestack emissions can be pumped directly into the ponds,feeding the algae while keeping greenhouse gases out of the atmosphere. Although processing technology for algae fuel--also known as "oilgae" in some environmentalist circles--is improving,it's still years away from reaching your local gas pump."It's just a question of cost,because no large-scale facilities have been built yet," Caspari says. Question: Compared with corn and soybeans,algae _ . Options: A: may pollute water and soil B: can grow in poor conditions C: provide much less energy D: need more special care
(Answer)
B
I'm taking a test and have to guess the right answer to the question after the article. Article: Dick was a twenty-year-old man. His father was a teacher and taught chemistry in a middle school and his mother worked in a shop. They lived a happy life until his parents died one night when suddenly an earthquake broke out. Luckily his sister took him to see their aunt in the city and they did not stay at home. Everything was destroyed in the earthquake and the two children got into trouble. Thanks to their aunt who was not rich enough, they grew up but they lived a hard life. His sister was so sad that she became a nun . After he finished middle school, he was introduced to an owner of a hotel and began to work there. One day the young man fell to the ground while he was cleaning a window on the second floor. He was sent to the hospital and the doctor looked him over. One of his legs was broken and he had to be in hospital. He said to the nurse, "I'm a poor man, madam. Arrange a third-class ward for me, please." "Can't anybody help you?" "No, madam," answered Dick. "I have only a sister. She's a nun and she's poor, too." "I don't think so," the nurse said angrily. "Nuns usually marry God. And God is the richest in the world, you know!" "Well, then," Dick said with a smile. "Please arrange a first-class ward for me and post the bill to my brother-in-law." Question: After Dick finished middle school, _ . Options: A: he stayed at home B: he began to work in the hotel C: he began to look for a job D: he broke his leg
B