Read the article and select the best answer. Article: When you hear the word "farm", chances are you picture rolling hills in the country covered with cows and cornstalks. Some scientists, engineers and city planners say the farms of the future could rise straight into the air---in skyscrapers in the world's most populated cities. It might sound far--fetched, but in fact, some of the technology for growing crops indoors already exists. The scientists at the South Pole research station enjoy fresh salads every day from vegetables they grow in their own greenhouse. And NASA has been experimenting for years with methods for growing fresh fruits on the moon or even on Mars. As is known, traditional farming takes a plot of land as big as the entire state of Virginia just to grow enough food for 8 million people, says ecologist Dichson Despommer. Cities that can't grow their own food are often influenced by disasters such as hurricanes that can make it impossible for trucks to deliver fresh produce to grocery stores. In addition, fruit and vegetables grown outdoors face all kinds of dangers, from flooding to insect pests to weather instability, such as late or early frosts that can damage a crop. "You can control everything indoors. You can't control anything outdoors," Despommier says. To top it off, by the year 2050, the world population will grow by another 3 billion. "Where will we grow the food for all these people?" Vertical farming----growing crops in skyscrapers, tens of stories high----is the answer," says Despommier. Others say _ could provide new uses for hundreds of abandoned buildings in cities around the world. Crop waste, like leaves, would be composted , and the gases given off from composting would be used to heat the building. "I'd say it is going to be tough," says agriculturist Giacomelli. It can be tricky to regulate climate conditions indoors. Plus, plants differ in their weather and lighting requirements. Tomatoes like warm, sunny weather, while greens like lettuce prefer cooler temperatures. And nearly all crop plants require... Question: What attitude does Giacomelli have towards the vertical farming? Options: A: Positive B: Negative C: Uninterested. D: Uncertain
D

Read the article and select the best answer. Article: Mark Twain, the famous American writer, liked to play jokes on others. But once a joke was played on him. One day Mark Twain was invited to give a talk in a small town. At lunch he met a young man, one of his friends. The young man said that he has an uncle with him. He told Twain that his uncle never laughed or smiled, and that nobody and nothing was able to make his uncle smile or laugh. "You bring your uncle to my talk tonight," said Mark Twain. "I'm sure I can make him laugh" That evening the young man and his uncle sat in the front. Mark Twain began to speak. He told several funny stories. This made everyone in the room laugh. But the man never even smiled. Mark Twain told more funny stories, but the old man still kept quiet. Mark Twain told his funny stories. Finally he stopped. He was tired and quite disappointed. Some days later, Mark Twain told another friend of his about what had happened. "Oh," said his friend. "I know that old man. He's been deaf for years." Question: The young man and his uncle sat _ that evening. Options: A: at home B: near the door C: at the back D: in the front
D

Read the article and select the best answer. Article: The term "smog" was first used in London during the early 1900's to describe the combination of smoke and fog. What we typically call " smog" today is a mixture of pollutants but is primarily made up of ground-level ozone . Ozone can be beneficial or harmful depending on where it stays. The ozone staying high above the Earth protects human health and the environment, but ground-level ozone is responsible for the choking, coughing, and painful eyes associated with smog. The ozone in smog also prevents plants growth and can cause widespread damage to crops and forest. Major smog occurrences often are linked to heavy motor vehicle traffic, high temperatures, sunshine, and calm winds. Weather and geography affect the position and severity of smog. Because temperature regulates the length of time it takes for smog to form, smog can form faster and be more severe on a hot and sunny day. When warm air stays near the ground instead of rising and winds are calm, smog may stay trapped over your city for days. As traffic and other sources add more pollutants to the air, the smog gets worse. Smog is often more severe away from the pollution sources because the chemical reactions that cause smog occur in the atmosphere while the reacting chemicals are being moved by the wind. Smog is a visible example of air pollution. You can look into the distance during the day to see how much smog there is in the air. In addition, most cities measure the concentrations of pollutants in the air and report the results to the public. Environmental Protection Agency sets national standards for pollutants. Areas that fail to meet the standards for at least one air pollutant are called "nonattainment areas. " New measures are being taken by local governments across the country to reduce air pollution in nonattainment areas. These include: banning charcoal barbecues and wood burning in stoves or fireplaces when pollution levels are high; developing programs to encourage carpooling and voluntary "ozone actions" ;... Question: Which of the following is TRUE according to the passage? Options: A: Air quality is better in time of calm wind. B: Smog is more severe near pollution sources. C: It takes more time for smog to form in hot weather. D: Chemical reactions occur in the moving air and cause smog.
D